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130-1076: Small-scale agriculture is often in tension with industrial agriculture , which finds efficiencies by increasing outputs, monoculture , consolidating land under big agricultural operations, and economies of scale . Certain labor-intensive cash crops, such as cocoa production in Ghana or Côte d'Ivoire , rely heavily on smallholders; globally, as of 2008, 90% of cocoa is grown by smallholders. These farmers rely on cocoa for up to 60 to 90 per cent of their income. Similar trends in supply chains exist in other crops like coffee , palm oil , and bananas. In other markets, small scale agriculture can increase food system investment in small holders improving food security. Today, some companies try to include smallholdings into their value chain , providing seed, feed, or fertilizer to improve production. Because smallholding farms frequently require less industrial inputs and can be an important way to improve food security and sustainable food systems in less-developed contexts, addressing

260-448: A crofter's dwelling thereon. A crofter is one who has tenure and use of the land, typically as a tenant farmer , especially in rural areas. Smallholder farms, also known as small-scale farms, encompass a diverse array of agricultural operations, varying from those owning the land they cultivate to those who do not. These farmers, often family-oriented, rely significantly on family labor to meet production needs, with women contributing

390-642: A decadal timescale. Other changes are caused by an imbalance of energy from external forcings . Examples of these include changes in the concentrations of greenhouse gases , solar luminosity , volcanic eruptions, and variations in the Earth's orbit around the Sun. To determine the human contribution to climate change, unique "fingerprints" for all potential causes are developed and compared with both observed patterns and known internal climate variability . For example, solar forcing—whose fingerprint involves warming

520-408: A disproportionate impact on the poor as they spend a large proportion of their income on food. " Concentrated animal feeding operations " or "intensive livestock operations", can hold large numbers (some up to hundreds of thousands) of animals, often indoors. These animals are typically cows, hogs, turkeys, or chickens. The distinctive characteristics of such farms is the concentration of livestock in

650-452: A given space. The aim of the operation is to produce as much meat, eggs, or milk at the lowest possible cost and with the greatest level of food safety. Food and water are supplied in place, and artificial methods are often employed to maintain animal health and improve production, such as therapeutic use of antimicrobial agents, vitamin supplements and growth hormones. Growth hormones are not used in chicken meat production nor are they used in

780-420: A high output per worker , some small-scale, sustainable, polyculture farmers can produce more food per acre of land. Small farms have some economic advantages. Farmers support the local economy of their communities. An American study showed that small farms with incomes of $ 100,000 or less spend almost 95 percent of their farm-related expenses within their local communities. The same study took into comparison

910-612: A higher percentage of the retail price , although they will spend more time selling the same amounts of product, which is an opportunity cost . Because smallholding farms frequently require less industrial inputs and can be an important way to improve food security in less-developed contexts, addressing the productivity and financial sustainability of small holders is an international development priority and measured by indicator 2.3 of Sustainable Development Goal 2 . The International Fund for Agricultural Development has an ongoing program for Adaptation for Smallholder Agriculture. During

1040-542: A lot of light to being dark after the ice has melted, they start absorbing more heat . Local black carbon deposits on snow and ice also contribute to Arctic warming. Arctic surface temperatures are increasing between three and four times faster than in the rest of the world. Melting of ice sheets near the poles weakens both the Atlantic and the Antarctic limb of thermohaline circulation , which further changes

1170-412: A marked increase in temperature. Ongoing changes in climate have had no precedent for several thousand years. Multiple independent datasets all show worldwide increases in surface temperature, at a rate of around 0.2 °C per decade. The 2014–2023 decade warmed to an average 1.19 °C [1.06–1.30 °C] compared to the pre-industrial baseline (1850–1900). Not every single year was warmer than

1300-436: A new marketing program for consumers on commend, Their application of severance pay for the protections or generic formation s of produces in their cultural well of information, and Globalization Global trademark . These methods are widespread in developed Nationals goods and increasing prescriptions for worldwide. medicine .Most of the [[gains], vegetable , dairy , fruits and goods are in supermarkets are producesin

1430-688: A period of agricultural development in Britain between the 16th century and the mid-19th century, which saw a massive increase in agricultural productivity and net output. This in turn supported unprecedented population growth, freeing up a significant percentage of the workforce, and thereby helped drive the Industrial Revolution . How this came about is not entirely clear. In recent decades, historians cited four key changes in agricultural practices, enclosure , mechanization , four-field crop rotation and selective breeding , and gave credit to

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1560-408: A physical climate model. These models simulate how population, economic growth , and energy use affect—and interact with—the physical climate. With this information, these models can produce scenarios of future greenhouse gas emissions. This is then used as input for physical climate models and carbon cycle models to predict how atmospheric concentrations of greenhouse gases might change. Depending on

1690-644: A range of roles including buying crops, providing seed, and acting as financial institutions. In low-income countries, women make up 43 percent of smallholding agricultural labor but produce 60–80 percent of food crops. In India, there is five sizes classification for smallholders. These are 'marginal' less than 1 hectare ( 2 + 1 ⁄ 2 acres), 'small' between 1 and 2 hectares ( 2 + 1 ⁄ 2 and 5 acres), 'semi medium' between 2 and 4 hectares (5 and 10 acres), 'medium' between 4 and 10 hectares (9.9 and 24.7 acres), 'large' above 10 hectares (25 acres). If we use 4 hectares (10 acres) (marginal + small + medium) as

1820-509: A relatively few individuals. The challenges and issues of industrial agriculture for global and local society, for the industrial agriculture sector, for the individual industrial agriculture farm, and for animal rights include the costs and benefits of both current practices and proposed changes to those practices. This is a continuation of thousands of years of the invention and use of technologies in feeding ever growing populations. [W]hen hunter-gatherers with growing populations depleted

1950-461: A result of climate change. Global sea level is rising as a consequence of thermal expansion and the melting of glaciers and ice sheets . Sea level rise has increased over time, reaching 4.8 cm per decade between 2014 and 2023. Over the 21st century, the IPCC projects 32–62 cm of sea level rise under a low emission scenario, 44–76 cm under an intermediate one and 65–101 cm under

2080-474: A result. The World Health Organization calls climate change one of the biggest threats to global health in the 21st century. Societies and ecosystems will experience more severe risks without action to limit warming . Adapting to climate change through efforts like flood control measures or drought-resistant crops partially reduces climate change risks, although some limits to adaptation have already been reached. Poorer communities are responsible for

2210-417: A small share of global emissions , yet have the least ability to adapt and are most vulnerable to climate change . Many climate change impacts have been observed in the first decades of the 21st century, with 2023 the warmest on record at +1.48 °C (2.66 °F) since regular tracking began in 1850. Additional warming will increase these impacts and can trigger tipping points , such as melting all of

2340-416: A standered and risk reduction) and social acceptability (better management practices). Climate change Present-day climate change includes both global warming —the ongoing increase in global average temperature —and its wider effects on Earth's climate . Climate change in a broader sense also includes previous long-term changes to Earth's climate. The current rise in global temperatures

2470-441: A standered of organic crop to commend the need of heal and to be profitableabout the ability and prosperous farming on communities . These goals have been defined by a variety of disciplines and may be looked at from the vantage point of the farmer or the consumer . Organic farming methods combine some aspects of scientific knowledge and highly limited modern technology with traditional farming practices; accepting some of

2600-831: A substantial portion of farm labor. The agricultural work on smallholder farms predominantly involves family members, with occasional hired labor, particularly during peak seasons. However, the productivity per hectare tends to increase with higher involvement of family members in farm activities. In addition to farm-related duties, women on smallholder farms often shoulder responsibilities such as collecting fuel and water and engaging in low-value, small-scale trading activities. Many smallholder farms supplement their income through off-farm work, crucial for sustaining livelihoods, particularly during agricultural downturns like droughts. Engaging in off-farm employment also serves to build social capital and resilience within these communities. Having multiple sources of income or employment opportunities off

2730-454: A threshold, 94.3% of holdings are small and these constitute 65.2% of all farmland. The bulk of India's hungry and poor people are constituted of smallholder farmers and landless people. 78% country's farmers own less than 2 hectares (5 acres), which constitutes 33% of total farmland but at the same time, they produce 41% of the country's food grains. 20% of the world's poor live in India, although

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2860-590: A variety developed by Orville Vogel from Japanese dwarf wheat varieties, was instrumental in developing Green Revolution wheat cultivars. IR8, the first widely implemented HYV rice to be developed by the International Rice Research Institute , was created through a cross between an Indonesian variety named "Peta" and a Chinese variety named "Dee Geo Woo Gen." With the availability of molecular genetics in Arabidopsis and rice

2990-548: A very high emission scenario. Marine ice sheet instability processes in Antarctica may add substantially to these values, including the possibility of a 2-meter sea level rise by 2100 under high emissions. Climate change has led to decades of shrinking and thinning of the Arctic sea ice . While ice-free summers are expected to be rare at 1.5 °C degrees of warming, they are set to occur once every three to ten years at

3120-519: A warming level of 2 °C. Higher atmospheric CO 2 concentrations cause more CO 2 to dissolve in the oceans, which is making them more acidic . Because oxygen is less soluble in warmer water, its concentrations in the ocean are decreasing , and dead zones are expanding. Greater degrees of global warming increase the risk of passing through ' tipping points '—thresholds beyond which certain major impacts can no longer be avoided even if temperatures return to their previous state. For instance,

3250-475: Is agriculture farming that refers to the industal society that produce the principal of crops and Industrial Farming are for animals and grain . Their methods of industrial agriculture farming include in ovation in agricultural machines and farming gear organic crop , gallon of water and chanmember of the mergen fee that can help with in our family to commend the techniques for achieving economies of scaleof development in productive culture of creation

3380-440: Is driven by human activities , especially fossil fuel burning since the Industrial Revolution . Fossil fuel use, deforestation , and some agricultural and industrial practices release greenhouse gases . These gases absorb some of the heat that the Earth radiates after it warms from sunlight , warming the lower atmosphere. Carbon dioxide , the primary greenhouse gas driving global warming, has grown by about 50% and

3510-506: Is a longstanding concern among some segments of the agricultural community. Others view these changes as inevitable, and even necessary to maintain the efficiency and competitiveness of the sector. Farm typology analysis by the USDA Economic Research Service divides the small family farm category into five groups: Many farmers are upset by their inability to fix the new types of high-tech farm equipment. This

3640-577: Is a practice in which the by-products (wastes) from one species are recycled to become inputs ( fertilizers , food ) for another. Federal Indian Gane Economic development in producing a interest in the rating of land marking for goods and aquacultureand water animals also (e.g. fish , fish ) is combination of production in the producing of organic farming with in organic extra tie (e.g. sea root ) and organic extractive (e.g. fish ) aquaculture to create balanced system s for environmental sustainability dow and (bio-mitigation), economic stabilityto (product

3770-564: Is an estimated total sea level rise of 2.3 metres per degree Celsius (4.2 ft/°F) after 2000 years. Oceanic CO 2 uptake is slow enough that ocean acidification will also continue for hundreds to thousands of years. Deep oceans (below 2,000 metres (6,600 ft)) are also already committed to losing over 10% of their dissolved oxygen by the warming which occurred to date. Further, the West Antarctic ice sheet appears committed to practically irreversible melting, which would increase

3900-446: Is associated with substantial deterioration of human living conditions in nearby rural communities. Future increase in food commodity prices, driven by the energy price rises under peak oil and dependency of industrial agriculture on fossil fuels is expected to lead to increase in food prices which has particular impacts on poor people. An example of this can be seen in the 2007–2008 world food price crisis . Food price increases have

4030-488: Is at levels not seen for millions of years. Climate change has an increasingly large impact on the environment . Deserts are expanding , while heat waves and wildfires are becoming more common. Amplified warming in the Arctic has contributed to thawing permafrost , retreat of glaciers and sea ice decline . Higher temperatures are also causing more intense storms , droughts, and other weather extremes . Rapid environmental change in mountains , coral reefs , and

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4160-418: Is completed. Work is reliant on outsourcing in order to complete labor farming tasks, but is also an essential part in the way management and financial work is completed. Social value system of farming changed when using a management model. Farmers have to take into consideration the division between good and bad farming tactics under the new management model. Many farmers were reluctant to mobilize because of

4290-650: Is cruel to animals. As they become more common, so do concerns about air pollution and ground water contamination, and the effects on human health of the pollution and the use of antibiotics and growth hormones. According to the U.S. Centers for Disease Control and Prevention (CDC), farms on which animals are intensively reared can cause adverse health reactions in farm workers. Workers may develop acute and chronic lung disease, musculoskeletal injuries, and may catch infections that transmit from animals to human beings. These type of transmissions, however, are extremely rare, as zoonotic diseases are uncommon. The projects within

4420-711: Is determined by modelling the carbon cycle and climate sensitivity to greenhouse gases. According to UNEP , global warming can be kept below 1.5 °C with a 50% chance if emissions after 2023 do not exceed 200 gigatonnes of CO 2 . This corresponds to around 4 years of current emissions. To stay under 2.0 °C, the carbon budget is 900 gigatonnes of CO 2 , or 16 years of current emissions. The climate system experiences various cycles on its own which can last for years, decades or even centuries. For example, El Niño events cause short-term spikes in surface temperature while La Niña events cause short term cooling. Their relative frequency can affect global temperature trends on

4550-546: Is due mostly to companies using intellectual property law to prevent farmers from having the legal right to fix their equipment (or gain access to the information to allow them to do it). This has encouraged groups such as Open Source Ecology and Farm Hack to begin to make open-source agricultural machinery. The debate concerning the role of small farms within the European Union is ongoing. The European Commission states that more than three-quarters of farm holdings in

4680-399: Is independent of where greenhouse gases are emitted, because the gases persist long enough to diffuse across the planet. Since the pre-industrial period, the average surface temperature over land regions has increased almost twice as fast as the global average surface temperature. This is because oceans lose more heat by evaporation and oceans can store a lot of heat . The thermal energy in

4810-466: Is lack of detailed, context-specific information on what climate change portends to smallholder farmers in different and widely varying agroecological environments and socio-economic realities, and what management strategies they are employing to deal with these impacts. Especially for smallholders working in commodity crops, climate change introduces an increasing amount of variability to farmer economic viability; for example, coffee production globally

4940-546: Is more concentrated.For example, in the 2000s; the price of farmland in the United States increased due to the Midwest farming crisis. The number of small- and medium-scale farming operations decreased due to the increased production and farmland costs. This forced farmers to find alternatives by taking advantage of new products of industrial agriculture such as financialization . Financialization takes place through

5070-450: Is primarily attributed to sulfate aerosols produced by the combustion of fossil fuels with heavy sulfur concentrations like coal and bunker fuel . Smaller contributions come from black carbon (from combustion of fossil fuels and biomass), and from dust. Globally, aerosols have been declining since 1990 due to pollution controls, meaning that they no longer mask greenhouse gas warming as much. Aerosols also have indirect effects on

5200-444: Is radiating into space. Warming reduces average snow cover and forces the retreat of glaciers . At the same time, warming also causes greater evaporation from the oceans , leading to more atmospheric humidity , more and heavier precipitation . Plants are flowering earlier in spring, and thousands of animal species have been permanently moving to cooler areas. Different regions of the world warm at different rates . The pattern

5330-516: Is shaped by feedbacks, which either amplify or dampen the change. Self-reinforcing or positive feedbacks increase the response, while balancing or negative feedbacks reduce it. The main reinforcing feedbacks are the water-vapour feedback , the ice–albedo feedback , and the net effect of clouds. The primary balancing mechanism is radiative cooling , as Earth's surface gives off more heat to space in response to rising temperature. In addition to temperature feedbacks, there are feedbacks in

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5460-432: Is that they were developed as F1 hybrids , meaning they need to be purchased by a farmer every season rather than saved from previous seasons, thus increasing a farmer's cost of production. The idea and practice of sustainable culture has arisen in response to the problems of industrial agriculture. Sustainable agriculture integrates three main goals: environmental stewardship , a culture of defense Manual factoring

5590-407: Is the major reason why different climate models project different magnitudes of warming for a given amount of emissions. A climate model is a representation of the physical, chemical and biological processes that affect the climate system. Models include natural processes like changes in the Earth's orbit, historical changes in the Sun's activity, and volcanic forcing. Models are used to estimate

5720-547: Is therefore a need to 'de-couple' non-renewable energy usage from agricultural production. Other liabilities include peak phosphate as finite phosphate reserves are currently a key input into chemical fertilizer for industrial agriculture. Industrial agriculture uses huge amounts of water , energy , and industrial chemicals ; increasing pollution in the arable land , usable water and atmosphere . Herbicides , insecticides , fertilizers and animal waste products are accumulating in ground and surface waters . "Many of

5850-417: Is unclear. A related phenomenon driven by climate change is woody plant encroachment , affecting up to 500 million hectares globally. Climate change has contributed to the expansion of drier climate zones, such as the expansion of deserts in the subtropics . The size and speed of global warming is making abrupt changes in ecosystems more likely. Overall, it is expected that climate change will result in

5980-638: Is under increased threat, and smallholders in East Africa, such as in the Ugandan , Tanzanian or Kenyan industries, are rapidly losing both viable coffee land and productivity of plants. In some cases, smallholders are an important source of deforestation . For example, smallholders are an important component of the oil palm industry of Southeast Asia, contributing 40% of the production. Because such farmers are less able to access financing than larger businesses, they are unable to fund methods to increase

6110-511: The Atlantic meridional overturning circulation (AMOC), and irreversible damage to key ecosystems like the Amazon rainforest and coral reefs can unfold in a matter of decades. The long-term effects of climate change on oceans include further ice melt, ocean warming , sea level rise, ocean acidification and ocean deoxygenation. The timescale of long-term impacts are centuries to millennia due to CO 2 's long atmospheric lifetime. The result

6240-661: The Earth's energy budget . Sulfate aerosols act as cloud condensation nuclei and lead to clouds that have more and smaller cloud droplets. These clouds reflect solar radiation more efficiently than clouds with fewer and larger droplets. They also reduce the growth of raindrops , which makes clouds more reflective to incoming sunlight. Indirect effects of aerosols are the largest uncertainty in radiative forcing . While aerosols typically limit global warming by reflecting sunlight, black carbon in soot that falls on snow or ice can contribute to global warming. Not only does this increase

6370-417: The European Union for any animal. In meat production, methods are also sometimes employed to control undesirable behaviours often related to stresses of being confined in restricted areas with other animals. More docile breeds are sought (with natural dominant behaviours bred out for example), physical restraints to stop interaction, such as individual cages for chickens, or animals physically modified, such as

6500-864: The Green Revolution spread technologies that had already existed, but had not been widely used outside of industrialized nations. These technologies included pesticides, irrigation projects and synthetic nitrogen fertilizer . The novel technological development of the Green Revolution was the production of what some referred to as "miracle seeds." Scientists created strains of maize , wheat and rice that are generally referred to as HYVs or " high-yielding varieties ." HYVs have an increased nitrogen-absorbing potential compared to other varieties. Since cereals that absorbed extra nitrogen would typically lodge, or fall over before harvest, semi-dwarfing genes were bred into their genomes. Norin 10 wheat ,

6630-573: The Greenland ice sheet is already melting, but if global warming reaches levels between 1.7 °C and 2.3 °C, its melting will continue until it fully disappears. If the warming is later reduced to 1.5 °C or less, it will still lose a lot more ice than if the warming was never allowed to reach the threshold in the first place. While the ice sheets would melt over millennia, other tipping points would occur faster and give societies less time to respond. The collapse of major ocean currents like

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6760-840: The Greenland ice sheet . Under the 2015 Paris Agreement , nations collectively agreed to keep warming "well under 2 °C". However, with pledges made under the Agreement, global warming would still reach about 2.8 °C (5.0 °F) by the end of the century. Limiting warming to 1.5 °C would require halving emissions by 2030 and achieving net-zero emissions by 2050. Fossil fuel use can be phased out by conserving energy and switching to energy sources that do not produce significant carbon pollution. These energy sources include wind , solar , hydro , and nuclear power . Cleanly generated electricity can replace fossil fuels for powering transportation , heating buildings , and running industrial processes. Carbon can also be removed from

6890-635: The Industrial Revolution , naturally-occurring amounts of greenhouse gases caused the air near the surface to be about 33 °C warmer than it would have been in their absence. Human activity since the Industrial Revolution, mainly extracting and burning fossil fuels ( coal , oil , and natural gas ), has increased the amount of greenhouse gases in the atmosphere. In 2022, the concentrations of CO 2 and methane had increased by about 50% and 164%, respectively, since 1750. These CO 2 levels are higher than they have been at any time during

7020-683: The US Secretary of Agriculture . A 1997 study by the United States Small Farms Commission defined small farms as those with less than $ 250,000 in gross receipts annually on which day-to-day labor and management are provided by the farmer and/or the farm family that owns the production, or owns or leases the productive assets. In 2000, such farms accounted for about 90% of the more than 2.1 million U.S. farms, but only about 40% of U.S. farm production. The concentration of production on fewer and larger operations

7150-518: The World Economic Forum , 14.5 million more deaths are expected due to climate change by 2050. 30% of the global population currently live in areas where extreme heat and humidity are already associated with excess deaths. By 2100, 50% to 75% of the global population would live in such areas. While total crop yields have been increasing in the past 50 years due to agricultural improvements, climate change has already decreased

7280-414: The carbon cycle . While plants on land and in the ocean absorb most excess emissions of CO 2 every year, that CO 2 is returned to the atmosphere when biological matter is digested, burns, or decays. Land-surface carbon sink processes, such as carbon fixation in the soil and photosynthesis, remove about 29% of annual global CO 2 emissions. The ocean has absorbed 20 to 30% of emitted CO 2 over

7410-402: The climate system . Solar irradiance has been measured directly by satellites , and indirect measurements are available from the early 1600s onwards. Since 1880, there has been no upward trend in the amount of the Sun's energy reaching the Earth, in contrast to the warming of the lower atmosphere (the troposphere ). The upper atmosphere (the stratosphere ) would also be warming if the Sun

7540-971: The extinction of many species. The oceans have heated more slowly than the land, but plants and animals in the ocean have migrated towards the colder poles faster than species on land. Just as on land, heat waves in the ocean occur more frequently due to climate change, harming a wide range of organisms such as corals, kelp , and seabirds . Ocean acidification makes it harder for marine calcifying organisms such as mussels , barnacles and corals to produce shells and skeletons ; and heatwaves have bleached coral reefs . Harmful algal blooms enhanced by climate change and eutrophication lower oxygen levels, disrupt food webs and cause great loss of marine life. Coastal ecosystems are under particular stress. Almost half of global wetlands have disappeared due to climate change and other human impacts. Plants have come under increased stress from damage by insects. The effects of climate change are impacting humans everywhere in

7670-432: The socioeconomic scenario and the mitigation scenario, models produce atmospheric CO 2 concentrations that range widely between 380 and 1400 ppm. The environmental effects of climate change are broad and far-reaching, affecting oceans , ice, and weather. Changes may occur gradually or rapidly. Evidence for these effects comes from studying climate change in the past, from modelling, and from modern observations. Since

7800-405: The 18th century and 1970 there was little net warming, as the warming impact of greenhouse gas emissions was offset by cooling from sulfur dioxide emissions. Sulfur dioxide causes acid rain , but it also produces sulfate aerosols in the atmosphere, which reflect sunlight and cause global dimming . After 1970, the increasing accumulation of greenhouse gases and controls on sulfur pollution led to

7930-560: The 1950s, droughts and heat waves have appeared simultaneously with increasing frequency. Extremely wet or dry events within the monsoon period have increased in India and East Asia. Monsoonal precipitation over the Northern Hemisphere has increased since 1980. The rainfall rate and intensity of hurricanes and typhoons is likely increasing , and the geographic range likely expanding poleward in response to climate warming. Frequency of tropical cyclones has not increased as

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8060-500: The 1980s, the terms global warming and climate change became more common, often being used interchangeably. Scientifically, global warming refers only to increased surface warming, while climate change describes both global warming and its effects on Earth's climate system , such as precipitation changes. Climate change can also be used more broadly to include changes to the climate that have happened throughout Earth's history. Global warming —used as early as 1975 —became

8190-440: The Arctic is forcing many species to relocate or become extinct . Even if efforts to minimize future warming are successful, some effects will continue for centuries. These include ocean heating , ocean acidification and sea level rise . Climate change threatens people with increased flooding , extreme heat, increased food and water scarcity, more disease, and economic loss . Human migration and conflict can also be

8320-435: The Arctic is another major feedback, this reduces the reflectivity of the Earth's surface in the region and accelerates Arctic warming . This additional warming also contributes to permafrost thawing, which releases methane and CO 2 into the atmosphere. Around half of human-caused CO 2 emissions have been absorbed by land plants and by the oceans. This fraction is not static and if future CO 2 emissions decrease,

8450-545: The CO 2 released by the chemical reactions for making cement , steel , aluminum , and fertilizer . Methane emissions come from livestock , manure, rice cultivation , landfills, wastewater, and coal mining , as well as oil and gas extraction . Nitrous oxide emissions largely come from the microbial decomposition of fertilizer . While methane only lasts in the atmosphere for an average of 12 years, CO 2 lasts much longer. The Earth's surface absorbs CO 2 as part of

8580-604: The Earth will be able to absorb up to around 70%. If they increase substantially, it'll still absorb more carbon than now, but the overall fraction will decrease to below 40%. This is because climate change increases droughts and heat waves that eventually inhibit plant growth on land, and soils will release more carbon from dead plants when they are warmer . The rate at which oceans absorb atmospheric carbon will be lowered as they become more acidic and experience changes in thermohaline circulation and phytoplankton distribution. Uncertainty over feedbacks, particularly cloud cover,

8710-822: The European Union are less than 10 hectares, with a large number less than five hectares,. However as of 2009 it had not established a formal definition of the term that could be used in its Common Agricultural Policy . The public perception of the possible benefits of small-scale farming has led to requests for further studies from the European Commission . [REDACTED]  This article incorporates public domain material from Jasper Womach. Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition (PDF) . Congressional Research Service . Industrial agriculture Template:Industrial Farming Industrial Agriculture

8840-599: The U.S., isolated cases of groundwater contamination has been linked to CAFOs. For example, the ten million hogs in North Carolina generate 19 million tons of waste per year. The U.S. federal government acknowledges the waste disposal issue and requires that animal waste be stored in lagoons . These lagoons can be as large as 7.5 acres (30,000 m ). Lagoons not protected with an impermeable liner can leak waste into groundwater under some conditions, as can runoff from manure spread back onto fields as fertilizer in

8970-441: The absorption of sunlight, it also increases melting and sea-level rise. Limiting new black carbon deposits in the Arctic could reduce global warming by 0.2 °C by 2050. The effect of decreasing sulfur content of fuel oil for ships since 2020 is estimated to cause an additional 0.05 °C increase in global mean temperature by 2050. As the Sun is the Earth's primary energy source, changes in incoming sunlight directly affect

9100-411: The atmosphere , for instance by increasing forest cover and farming with methods that capture carbon in soil . Before the 1980s it was unclear whether the warming effect of increased greenhouse gases was stronger than the cooling effect of airborne particulates in air pollution . Scientists used the term inadvertent climate modification to refer to human impacts on the climate at this time. In

9230-452: The atmosphere. volcanic CO 2 emissions are more persistent, but they are equivalent to less than 1% of current human-caused CO 2 emissions. Volcanic activity still represents the single largest natural impact (forcing) on temperature in the industrial era. Yet, like the other natural forcings, it has had negligible impacts on global temperature trends since the Industrial Revolution. The climate system's response to an initial forcing

9360-532: The benefits: while minimizing the downsides: An example of industrial agriculture providing cheap and plentiful food is the U.S.'s "most successful program of agricultural development of any country in the world". Between 1930 and 2000 U.S. agricultural productivity (output divided by all inputs) rose by an average of about 2 percent annually causing food prices paid by consumers to decrease. "The percentage of U.S. disposable income spent on food prepared at home decreased, from 22 percent as late as 1950 to 7 percent by

9490-454: The biggest threats to global health in the 21st century. Scientists have warned about the irreversible harms it poses. Extreme weather events affect public health, and food and water security . Temperature extremes lead to increased illness and death. Climate change increases the intensity and frequency of extreme weather events. It can affect transmission of infectious diseases , such as dengue fever and malaria . According to

9620-540: The carbon cycle, such as the fertilizing effect of CO 2 on plant growth. Feedbacks are expected to trend in a positive direction as greenhouse gas emissions continue, raising climate sensitivity. These feedback processes alter the pace of global warming. For instance, warmer air can hold more moisture in the form of water vapour , which is itself a potent greenhouse gas. Warmer air can also make clouds higher and thinner, and therefore more insulating, increasing climate warming. The reduction of snow cover and sea ice in

9750-755: The case in the Global North , the reverse happened: they got smaller and more numerous. Several definitions of small farm have been formulated in legislation. In 1977 the US Congress , via the Food and Agriculture Act of 1977 , defined a small farm as one with sales under $ 20,000. At the time these comprised 70% of farms in the US. The Act sponsored additional research on small farming operations by US land grant universities and their extension services and mandated that an annual report on these activities be issued by

9880-416: The case of an unforeseen heavy rainfall. A lagoon that burst in 1995 released 25 million gallons of nitrous sludge in North Carolina's New River. The spill allegedly killed eight to ten million fish. The large concentration of animals, animal waste and dead animals in a small space poses ethical issues to some consumers. Animal rights and animal welfare activists have charged that intensive animal rearing

10010-551: The climate cycled through ice ages . One of the hotter periods was the Last Interglacial , around 125,000 years ago, where temperatures were between 0.5 °C and 1.5 °C warmer than before the start of global warming. This period saw sea levels 5 to 10 metres higher than today. The most recent glacial maximum 20,000 years ago was some 5–7 °C colder. This period has sea levels that were over 125 metres (410 ft) lower than today. Temperatures stabilized in

10140-402: The country was self-sufficient in food production in 2002 due to the first Green Revolution started in the latter half of the twentieth century, numerous households lacked resources to purchase food. Holdings less than 2 ha contributed 41% of total food grain production in 1991 compared to 28% in 1971, which means a substantial increase, whereas medium holdings registered a mere 3% increase in

10270-684: The current interglacial period beginning 11,700 years ago . This period also saw the start of agriculture. Historical patterns of warming and cooling, like the Medieval Warm Period and the Little Ice Age , did not occur at the same time across different regions. Temperatures may have reached as high as those of the late 20th century in a limited set of regions. Climate information for that period comes from climate proxies , such as trees and ice cores . Around 1850 thermometer records began to provide global coverage. Between

10400-682: The de-beaking of chickens to reduce the harm of fighting. Weight gain is encouraged by the provision of plentiful supplies of food to animals breed for weight gain. The designation "confined animal feeding operation" in the U.S. resulted from that country's 1972 Federal Clean Water Act, which was enacted to protect and restore lakes and rivers to a "fishable, swimmable" quality. The United States Environmental Protection Agency (EPA) identified certain animal feeding operations, along with many other types of industry, as point source polluters of groundwater. These operations were designated as CAFOs and subject to special anti-pollution regulation. In 17 states in

10530-403: The degree of warming future emissions will cause when accounting for the strength of climate feedbacks . Models also predict the circulation of the oceans, the annual cycle of the seasons, and the flows of carbon between the land surface and the atmosphere. The physical realism of models is tested by examining their ability to simulate current or past climates. Past models have underestimated

10660-427: The destroyed trees release CO 2 , and are not replaced by new trees, removing that carbon sink . Between 2001 and 2018, 27% of deforestation was from permanent clearing to enable agricultural expansion for crops and livestock. Another 24% has been lost to temporary clearing under the shifting cultivation agricultural systems. 26% was due to logging for wood and derived products, and wildfires have accounted for

10790-543: The distinctions among farm sizes since the field's inception. Traditional agricultural economic theory considered small farms inefficient, a stance that began to be challenged in the 1950s. An overview of research published by the World Bank in 1998 indicated that the productivity of small farms often exceeded that of larger ones. A croft is a traditional Scottish term for a fenced or enclosed area of land, usually small and arable , and usually, but not always, with

10920-401: The distribution of heat and precipitation around the globe. The World Meteorological Organization estimates there is an 80% chance that global temperatures will exceed 1.5 °C warming for at least one year between 2024 and 2028. The chance of the 5-year average being above 1.5 °C is almost half. The IPCC expects the 20-year average global temperature to exceed +1.5 °C in

11050-444: The dominant direct influence on temperature from land use change. Thus, land use change to date is estimated to have a slight cooling effect. Air pollution, in the form of aerosols, affects the climate on a large scale. Aerosols scatter and absorb solar radiation. From 1961 to 1990, a gradual reduction in the amount of sunlight reaching the Earth's surface was observed. This phenomenon is popularly known as global dimming , and

11180-610: The early 2030s. The IPCC Sixth Assessment Report (2021) included projections that by 2100 global warming is very likely to reach 1.0–1.8 °C under a scenario with very low emissions of greenhouse gases , 2.1–3.5 °C under an intermediate emissions scenario , or 3.3–5.7 °C under a very high emissions scenario . The warming will continue past 2100 in the intermediate and high emission scenarios, with future projections of global surface temperatures by year 2300 being similar to millions of years ago. The remaining carbon budget for staying beneath certain temperature increases

11310-435: The economy. Diversification of crops in smallholder farms is one of the potential strategies in sustaining agricultural productivity, and copping with marketing risks. It is also a transitional step from subsistence to commercial agriculture. Age, education of household head, type of crops, cropping system, amount of credit, and irrigation facilities are some of the factors influencing diversification in smallholder farms. Along

11440-612: The effect this would have on their family business. The separation between the management styles of farmers comes down to two approaches; farming as a lifestyle versus farming solely for profit. In the Brazilian Cerrado the farming model is strictly based on increased profit margins which dictates decisions involving management and labor related work. In the U.S., four companies produce 81 percent of cows, 73 percent of sheep, 57 percent of pigs, and produce 50 percent of chickens, cited as an example of " vertical integration " by

11570-530: The end of the century." Economic liabilities for industrial agriculture include the dependence on finite non-renewable fossil fuel energy resources, as an input in farm mechanization (equipment, machinery), for food processing and transportation, and as an input in agricultural chemicals. A future increase in energy prices as projected by the International Energy Agency is therefore expected to result in increase in food prices; and there

11700-430: The entire atmosphere—is ruled out because only the lower atmosphere has warmed. Atmospheric aerosols produce a smaller, cooling effect. Other drivers, such as changes in albedo , are less impactful. Greenhouse gases are transparent to sunlight , and thus allow it to pass through the atmosphere to heat the Earth's surface. The Earth radiates it as heat , and greenhouse gases absorb a portion of it. This absorption slows

11830-466: The fact that farms with incomes greater than $ 900,000 spend less than 20 percent of their farm-related expenses in the local economy. Small-scale agriculture often sells products directly to consumers. Disintermediation gives the farmer the profit that would otherwise go to the wholesaler, the distributor, and the supermarket. About two-thirds of the revenue is expended on product marketing. If farmers sell their products directly to consumers, they receive

11960-489: The farm contributes to the economic stability of smallholder farming households. These off-farm income-generating activities offer a buffer against agricultural shocks and allow for a diversified livelihood strategy, providing families with increased financial security and access to essential resources. In many developing countries , smallholding is a small plot of land with low rental value, used to grow crops. By some estimates, there are 525 million smallholder farmers in

12090-427: The farming sector was far less in 1990's when compared to previous decades. Kenya's smallholder means someone who owns, possess or produces agricultural products in small-scale . smallholder production accounts for 78 percent of total agricultural production and 70 percent of commercial production. Majority of the smallholder population work in farm sizes averaging 0.47 hectares (1 1 ⁄ 4 acres). This represents

12220-654: The first two decades of the 20th century, led to vitamin supplements, which in the 1920s allowed certain livestock to be raised indoors, reducing their exposure to adverse natural elements. The discovery of antibiotics and vaccines facilitated raising livestock in concentrated, controlled animal feed operations by reducing diseases caused by crowding. Chemicals developed for use in World War II gave rise to synthetic pesticides . Developments in shipping networks and technology have made long-distance distribution of agricultural produce feasible. Agricultural production across

12350-424: The global COVID-19 pandemic , and the attendant disruptions of food systems, their role has become more important. While the historical focus on smallholders has been increasing global food supply under climate change and the role played by smallholder communities, climate adaptation efforts are still hindered by lack of information on how smallholder farmers are experiencing and responding to climate change. There

12480-604: The global climate system has grown with only brief pauses since at least 1970, and over 90% of this extra energy has been stored in the ocean . The rest has heated the atmosphere , melted ice, and warmed the continents. The Northern Hemisphere and the North Pole have warmed much faster than the South Pole and Southern Hemisphere . The Northern Hemisphere not only has much more land, but also more seasonal snow cover and sea ice . As these surfaces flip from reflecting

12610-571: The investment appears low-risk with high rewards. For example, investors would gain inside information on the market in Brazil. In the article Financialization of work, value, and social organization among transnational soy farmers in the Brazilian Cerrado Ofstehage gives examples of how industrialized farming has evolved into a management model. A management model entails the structure and rules that ensure work of management

12740-572: The last 14 million years. Concentrations of methane are far higher than they were over the last 800,000 years. Global human-caused greenhouse gas emissions in 2019 were equivalent to 59 billion tonnes of CO 2 . Of these emissions, 75% was CO 2 , 18% was methane , 4% was nitrous oxide, and 2% was fluorinated gases . CO 2 emissions primarily come from burning fossil fuels to provide energy for transport , manufacturing, heating , and electricity. Additional CO 2 emissions come from deforestation and industrial processes , which include

12870-436: The last two decades. CO 2 is only removed from the atmosphere for the long term when it is stored in the Earth's crust, which is a process that can take millions of years to complete. Around 30% of Earth's land area is largely unusable for humans ( glaciers , deserts , etc.), 26% is forests , 10% is shrubland and 34% is agricultural land . Deforestation is the main land use change contributor to global warming, as

13000-441: The last: internal climate variability processes can make any year 0.2 °C warmer or colder than the average. From 1998 to 2013, negative phases of two such processes, Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) caused a short slower period of warming called the " global warming hiatus ". After the "hiatus", the opposite occurred, with years like 2023 exhibiting temperatures well above even

13130-456: The marketing year for severance of daily progress to commend. Industrial agriculture arose hand in hand with the Industrial Revolution in general. The identification of nitrogen , potassium and phosphorus (referred to by the acronym NPK) as critical factors in plant growth led to the manufacture of synthetic fertilizers , making possible more intensive types of agriculture. The discovery of vitamins and their role in animal nutrition , in

13260-433: The methods of industrial agriculture while rejecting others. Organic methods rely on naturally occurring biological processes, which often take place over extended periods of time, and a holistic approach; while chemical-based farming focuses on immediate, isolated effects and reductionist strategies. Integrated Multi-Trophic Aquaculture is an example of this holistic approach. Integrated Multi-Trophic Aquaculture (IMTA)

13390-413: The more popular term after NASA climate scientist James Hansen used it in his 1988 testimony in the U.S. Senate . Since the 2000s, climate change has increased usage. Various scientists, politicians and media may use the terms climate crisis or climate emergency to talk about climate change, and may use the term global heating instead of global warming . Over the last few million years

13520-403: The mutant genes responsible ( reduced height(rh) , gibberellin insensitive (gai1) and slender rice (slr1) ) have been cloned and identified as cellular signaling components of gibberellic acid, a phytohormone involved in regulating stem growth via its effect on cell division. Stem growth in the mutant background is significantly reduced leading to the dwarf phenotype. Photosynthetic investment in

13650-598: The negative effects of industrial agriculture are remote from fields and farms. Nitrogen compounds from the Midwest, for example, travel down the Mississippi to degrade coastal fisheries in the Gulf of Mexico. But other adverse effects are showing up within agricultural production systems—for example, the rapidly developing resistance among pests is rendering our arsenal of herbicides and insecticides increasingly ineffective.". Chemicals used in industrial agriculture, as well as

13780-487: The point of industrial agriculture is lower cost products to create greater productivity thus a higher standard of living as measured by available goods and services, industrial methods have side effects both good and bad. Further, industrial agriculture is not some single indivisible thing, but instead is composed of numerous separate elements, each of which can be modified, and in fact is modified in response to market conditions, government regulation and scientific advances. So

13910-587: The practice of monoculture, have also been implicated in Colony Collapse Disorder which has led to a collapse in bee populations. Agricultural production is highly dependent on bee pollination to pollinate many varieties of plants, fruits and vegetables. A study done for the U.S. Office of Technology Assessment conducted by the UC Davis Macrosocial Accounting Project concluded that industrial agriculture

14040-590: The president of the U.S. National Farmers' Union. In 1967, there were one million pig farms in America; as of 2002, there were 114,000 with 80 million pigs (out of 95 million) produced each year on factory farms, according to the U.S. National Pork Producers Council. According to the Worldwatch Institute , 74 percent of the world's poultry, 43 percent of beef and 68 percent of eggs are produced this way. The British agricultural revolution describes

14170-553: The process of ongoing monetization. An example of monetization involves financial institutions expanding and gain authority in the market. Financialization affects all aspects of farm operations, including the structure of the work, the value of it and the social organizations . Farmers turned to land availability in the Brazilian Cerrado through the help of investors and other capital gaining methods needed for financialization. investors wanted to get involved because

14300-513: The productivity and financial sustainability of smallholders is an international development priority and measured by indicator 2.3 of Sustainable Development Goal 2 . Additionally, since agriculture has such large impacts on climate change , Project Drawdown described "Sustainable Intensification for Smallholders" an important method for climate change mitigation . According to conventional theory, economies of scale allow agricultural productivity , in terms of inputs versus outputs, to rise as

14430-416: The productivity of their farms when yields decline, increasing their need to clear more land. Increasing productivity, especially amongst smallholder farms, is an important way to decrease the amount of land needed for farming and slow environmental degradation through processes like deforestation. The definition of a small farm has varied over time and by country. Agricultural economists have analyzed

14560-533: The question then becomes for each specific element that goes into an industrial agriculture method or technique or process: What bad side effects are bad enough that the financial gain and good side effects are outweighed? Different interest groups not only reach different conclusions on this, but also recommend differing solutions, which then become factors in changing both market conditions and government regulations. The major challenges and issues faced by society concerning industrial agriculture include: Maximizing

14690-619: The rate at which heat escapes into space, trapping heat near the Earth's surface and warming it over time. While water vapour (≈50%) and clouds (≈25%) are the biggest contributors to the greenhouse effect, they primarily change as a function of temperature and are therefore mostly considered to be feedbacks that change climate sensitivity . On the other hand, concentrations of gases such as CO 2 (≈20%), tropospheric ozone , CFCs and nitrous oxide are added or removed independently from temperature, and are therefore considered to be external forcings that change global temperatures. Before

14820-522: The rate of Arctic shrinkage and underestimated the rate of precipitation increase. Sea level rise since 1990 was underestimated in older models, but more recent models agree well with observations. The 2017 United States-published National Climate Assessment notes that "climate models may still be underestimating or missing relevant feedback processes". Additionally, climate models may be unable to adequately predict short-term regional climatic shifts. A subset of climate models add societal factors to

14950-622: The rate of yield growth . Fisheries have been negatively affected in multiple regions. While agricultural productivity has been positively affected in some high latitude areas, mid- and low-latitude areas have been negatively affected. According to the World Economic Forum, an increase in drought in certain regions could cause 3.2 million deaths from malnutrition by 2050 and stunting in children. With 2 °C warming, global livestock headcounts could decline by 7–10% by 2050, as less animal feed will be available. If

15080-405: The recent average. This is why the temperature change is defined in terms of a 20-year average, which reduces the noise of hot and cold years and decadal climate patterns, and detects the long-term signal. A wide range of other observations reinforce the evidence of warming. The upper atmosphere is cooling, because greenhouse gases are trapping heat near the Earth's surface, and so less heat

15210-411: The release of chemical compounds that influence clouds, and by changing wind patterns. In tropic and temperate areas the net effect is to produce significant warming, and forest restoration can make local temperatures cooler. At latitudes closer to the poles, there is a cooling effect as forest is replaced by snow-covered (and more reflective) plains. Globally, these increases in surface albedo have been

15340-476: The remaining 23%. Some forests have not been fully cleared, but were already degraded by these impacts. Restoring these forests also recovers their potential as a carbon sink. Local vegetation cover impacts how much of the sunlight gets reflected back into space ( albedo ), and how much heat is lost by evaporation . For instance, the change from a dark forest to grassland makes the surface lighter, causing it to reflect more sunlight. Deforestation can also modify

15470-520: The same period and large holdings registered a decline from 51 to 35%. This signifies the importance of smallholders in the Green Revolution and the attainment of national food security. Smallholder families are becoming more vulnerable and more disadvantaged due to the expansion of international trade liberalisation. The needs and aspirations of small farmers must feature prominently in policies of market reform that seek to improve food and nutritional security. India's total increase rate of productivity across

15600-583: The sea levels by at least 3.3 m (10 ft 10 in) over approximately 2000 years. Recent warming has driven many terrestrial and freshwater species poleward and towards higher altitudes . For instance, the range of hundreds of North American birds has shifted northward at an average rate of 1.5 km/year over the past 55 years. Higher atmospheric CO 2 levels and an extended growing season have resulted in global greening. However, heatwaves and drought have reduced ecosystem productivity in some regions. The future balance of these opposing effects

15730-407: The size of the farm rises. Specialization has also been a major factor in increasing agricultural productivity, for example as commodity processing began to move off the farm in the 19th century, farmers could spend more effort on primary food production. Although numerous studies show that larger farms are more productive than smaller ones, some writers state that whilst conventional farming creates

15860-447: The stem is reduced dramatically as the shorter plants are inherently more stable mechanically. Assimilates become redirected to grain production, amplifying in particular the effect of chemical fertilizers on commercial yield. HYVs significantly outperform traditional varieties in the presence of adequate irrigation, pesticides and fertilizers. In the absence of these inputs, traditional varieties may outperform HYVs. One criticism of HYVs

15990-740: The stocks of game and wild foods across the Near East, they were forced to introduce agriculture. But agriculture brought much longer hours of work and a less rich diet than hunter-gatherers enjoyed. Further population growth among shifting slash-and-burn farmers led to shorter fallow periods, falling yields and soil erosion. Plowing and fertilizers were introduced to deal with these problems—but once again involved longer hours of work and degradation of soil resources(Boserup, The Conditions of Agricultural Growth, Allen and Unwin, 1965, expanded and updated in Population and Technology, Blackwell, 1980.). While

16120-670: The upper and middle reaches of the Nduruma River in the Pangani River Basin, Tanzania, there is not enough water to go around. Smallholder farmers address inequities in land and water distribution by enforcing existing traditional local rules. Whilst larger estate farms may have governmental licences guaranteeing rights to the water, a study found that those large-scale farms which adhere to the traditional water rights structures fare better in terms of social reputation, which better ensures their access to water. Adhering to

16250-460: The vast majority of Kenya's rural poor population who depend on agriculture for their livelihood. Adverse risk events during the period 1980–2012 led to production losses in smallholder farms resulting in a drop in agricultural gross domestic product (GDP) of 2 percent or more. Increasing the productivity of smallholder farmers is encouraged due to its potential of improving food availability, increasing rural incomes, lowering poverty rates, and growing

16380-701: The water law in order to enforce their permits is less effective, as regional Tanzanian local governments generally attempt to avoid conflict with their populace. On a larger scale, however, existing traditional rules are ineffective in maintaining cooperation among users along the Nduruma River. In 1975, there were 4.2 million smallholder farming households in Thailand. In 2013, Thailand had 5.9 million smallholder farming households. The average area of these smallholdings had shrunk from 3.7 to 3.2 hectares ( 9 + 1 ⁄ 4 to 8 acres) over that period. Instead of farms getting larger and less numerous, as has been

16510-692: The world doubled four times between 1820 and 1975 (it doubled between 1820 and 1920; between 1920 and 1950; between 1950 and 1965; and again between 1965 and 1975) to feed a global population of one billion human beings in 1800 and 6.5 billion in 2002. During the same period, the number of people involved in farming dropped as the process became more automated. In the 1930s, 24 percent of the American population worked in agriculture compared to 1.5 percent in 2002; in 1940, each farm worker supplied 11 consumers, whereas in 2002, each worker supplied 90 consumers. The number of farms has also decreased, and their ownership

16640-438: The world. Impacts can be observed on all continents and ocean regions, with low-latitude, less developed areas facing the greatest risk. Continued warming has potentially "severe, pervasive and irreversible impacts" for people and ecosystems. The risks are unevenly distributed, but are generally greater for disadvantaged people in developing and developed countries. The World Health Organization calls climate change one of

16770-538: The world. These farms vary in land sizes, production and labor intensities. The distribution of farm sizes depends on a number of agroecological and demographic conditions, as well as on economic and technological factors. Smallholders are critical to local and regional food systems, as well as livelihoods, and especially so during periods of food supply chain disruptions. Smallholders dominate production in certain key sectors such as coffee and cocoa. Various types of agribusinesses enterprises work with smallholding farmers in

16900-524: Was sending more energy to Earth, but instead, it has been cooling. This is consistent with greenhouse gases preventing heat from leaving the Earth's atmosphere. Explosive volcanic eruptions can release gases, dust and ash that partially block sunlight and reduce temperatures, or they can send water vapour into the atmosphere, which adds to greenhouse gases and increases temperatures. These impacts on temperature only last for several years, because both water vapour and volcanic material have low persistence in

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