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The IPCC Third Assessment Report ( TAR ), Climate Change 2001 , is an assessment of available scientific and socio-economic information on climate change by the IPCC . Statements of the IPCC or information from the TAR were often used as a reference showing a scientific consensus on the subject of global warming . The Third Assessment Report (TAR) was completed in 2001 and consists of four reports, three of them from its Working Groups: Working Group I: The Scientific Basis; Working Group II: Impacts, Adaptation and Vulnerability; Working Group III: Mitigation; Synthesis Report. A number of the TAR's conclusions are given quantitative estimates of how probable it is that they are correct, e.g., greater than 66% probability of being correct. These are " Bayesian " probabilities, which are based on an expert assessment of all the available evidence.

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69-434: "Robust findings" of the Synthesis Report include: The IPCC was established in 1988 by the United Nations Environment Programme (UNEP) and the UN's World Meteorological Organization (WMO) "... to assess scientific, technical and socio-economic information relevant for the understanding of climate change, its potential impacts and options for adaptation and mitigation." The IPCC is organized as three working groups (WG) and

138-652: A Declaration on the Human Environment ( Stockholm Declaration ) and the establishment of an environmental management body, which was later named the United Nations Environment Program (UNEP). UNEP was established by General Assembly Resolution 2997. Headquarters were established in Nairobi , Kenya, with a staff of 300, including 100 professionals in a variety of fields, and with a five-year fund of more than US$ 100 million. At

207-535: A task force [1] : WG I covers the same areas as the Second Assessment Report ( SAR ) of 1995, but WG II & III cover slightly different areas in the TAR. The key conclusions of Working Group I were: The TAR estimate for the climate sensitivity is 1.5 to 4.5 °C; and the average surface temperature is projected to increase by 1.4 to 5.8 Celsius degrees over the period 1990 to 2100, and

276-647: A book with the Parliament of the World's Religions Climate Action Program entitled, "Faith for Earth: A Call for Action." The book serves as an educational resource for students, teachers, and leaders across the world and highlights the role that faith-based organizations can play in addressing critical environmental issues. UN assigns specific years to topics to raise awareness and engagement. The following years pertain to environmental topics: See international observance and list of environmental dates . Following

345-666: A joint statement with the United Nations University predicting that "50 million people could become environmental refugees by 2010, fleeing the effects of climate change ". This was reinforced in 2008, by Srgjan Kerim, President of the UN General Assembly, who estimated that there would be between 50 million and 200 million environmental migrants by 2010. In 2008, UNEP made a series of statements that glaciers are shrinking at record rates and many could disappear within decades. Scientists measuring

414-479: A limited term, normally 4–5 years, after which members become academy alumni. Young academies typically engage with issues important to young scientists. These include, for example, science education or the dialog between science and society. Most young academies are affiliated with a senior Academy of Sciences or with a network of senior academies. The Global Young Academy , which itself is a science academy (e.g. full member of Interacademy Partnership ) often serves as

483-692: A member of the United Nations Development Group , UNEP aims to help the world meet the 17 Sustainable Development Goals . UNEP hosts the secretariats of several multilateral environmental agreements and research bodies, including The Convention on Biological Diversity (CBD), The Minamata Convention on Mercury , The Basel , Rotterdam and Stockholm Conventions, The Convention on Migratory Species and The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), among others. In 1988,

552-515: A number of criticisms of the TAR. Among his criticisms, Lindzen has stated that the WGI Summary for Policymakers (SPM) does not faithfully summarize the full WGI report. For example, Lindzen states that the SPM understates the uncertainty associated with climate models . John Houghton , who was a co-chair of TAR WGI, has responded to Lindzen's criticisms of the SPM. Houghton has stressed that the SPM

621-607: A schematic in the first assessment report that lacked temperature units, but appeared to depict larger global temperature variations over the past 1000 years, and higher temperatures during the Medieval Warm Period than the mid 20th century. The schematic was not an actual plot of data, and was based on a diagram of temperatures in central England, with temperatures increased on the basis of documentary evidence of medieval vineyards in England . Even with this increase,

690-594: A universal member system (all UN member states). (UNEA, UN Environment Assembly) It was implemented once in 2014. The European Investment Bank and the United Nations Environment Programme created the Renewable Energy Performance Platform (REPP) in 2015 to assist a United Nations project dubbed Sustainable Energy for All. Renewable Energy Performance Platform was established with $ 67 million from

759-680: Is a global network consisting of over 140 national, regional and global member academies of science, engineering and medicine. Additionally, there are many regional associations such as ALLEA in Europe, NASAC as the Network of African Science Academies, IANAS in Latin America, and AASSA in Asia. Apart from national academies of science, there are now increasingly also national young academies. National young academies usually select members for

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828-436: Is a type of learned society or academy (as special scientific institution) dedicated to sciences that may or may not be state funded. Some state funded academies are national , or royal (i.e. United Kingdom's Royal Society of London for Improving Natural Knowledge ) as a form of honor. The other type of academies are Academy of Arts or combination of both (e.g., American Academy of Arts and Sciences ). Academy of Letters

897-515: Is agreed upon by delegates from many of the world's governments, and that any changes to the SPM must be supported by scientific evidence. IPCC author Kevin Trenberth has also commented on the WGI SPM. Trenberth has stated that during the drafting of the WGI SPM, some government delegations attempted to "blunt, and perhaps obfuscate, the messages in the report". However, Trenberth concludes that

966-654: Is another related expression, encompassing literature. In non-English-speaking countries, the range of academic fields of the members of a national Academy of Science often includes scholarly disciplines which would not normally be classed as "science" in English. Many languages use a broad term for systematized learning which includes both natural sciences and social sciences and fields such as literary studies, linguistics, history, or art history. (Often these terms are calques from Latin scientia (the etymological source of English science ) and, accordingly, derivatives of

1035-906: Is responsible for coordinating responses to environmental issues within the United Nations system. It was established by Maurice Strong , its first director, after the United Nations Conference on the Human Environment in Stockholm in June 1972. Its mandate is to provide leadership, deliver science and develop solutions on a wide range of issues, including climate change, the management of marine and terrestrial ecosystems , and green economic development. The organization also develops international environmental agreements ; publishes and promotes environmental science and helps national governments achieve environmental targets. As

1104-605: Is the co-chair and a founding partner (along with groups such as the Ellen MacArthur Foundation ) for the Platform for Accelerating the Circular Economy , which is a public-private partnership of over 50 global organizations and governments seeking to support the transition to a global circular economy . Established in 1974, this is the world's only legal programme for the purpose of protecting

1173-561: Is the solar loan programme sponsored by UNEP that helped 100,000 people finance solar power systems in India . Success in India's solar programme has led to similar projects in other parts of the developing world, including Tunisia , Morocco , Indonesia and Mexico . In 2001, UNEP alerted about the destruction of the Marshlands when it released satellite images showing that 90 percent of

1242-418: Is to continually question basic assumptions and conclusions, promote clear and careful appraisal and presentation of the uncertainties about climate change as well as those areas in which science is leading to robust conclusions, and work toward a significant improvement in the ability to project the future. In 2001, 16 national science academies issued a joint statement on climate change. The joint statement

1311-780: The Canadian Foundation for Climate and Atmospheric Sciences , Canadian Meteorological and Oceanographic Society , and European Geosciences Union (refer to " Endorsements of the IPCC "). In 2001, the US National Research Council (US NRC) produced a report that assessed Working Group I's (WGI) contribution to the TAR. US NRC (2001) "generally agrees" with the WGI assessment, and describes the full WGI report as an "admirable summary of research activities in climate science". IPCC author Richard Lindzen has made

1380-677: The House Committee on Energy and Commerce , wrote joint letters with Ed Whitfield , chairman of the Subcommittee on Oversight and Investigations , demanding full records on climate research, as well as personal information about their finances and careers, from Mann, Bradley and Hughes. Sherwood Boehlert , chairman of the House Science Committee , said this was a "misguided and illegitimate investigation" apparently aimed at intimidating scientists, and at his request

1449-965: The Royal Irish Academy , Accademia Nazionale dei Lincei (Italy), the Academy of Sciences Malaysia , the Academy Council of the Royal Society of New Zealand , the Royal Swedish Academy of Sciences , and the Royal Society (UK). The statement, also published as an editorial in the journal Science , stated "we support the [TAR's] conclusion that it is at least 90% certain that temperatures will continue to rise, with average global surface temperature projected to increase by between 1.4 and 5.8 °C above 1990 levels by 2100". The TAR has also been endorsed by

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1518-500: The U.S. National Academy of Sciences arranged for its National Research Council to set up a special investigation. The National Research Council's report agreed that there were some statistical failings, but these had little effect on the graph, which was generally correct. In a 2006 letter to Nature , Mann, Bradley, and Hughes pointed out that their original article had said that "more widespread high-resolution data are needed before more confident conclusions can be reached" and that

1587-716: The United Kingdom 's International Climate Finance initiative, administered by the Department for Business, Energy and Industrial Strategy , in 2015, and $ 128 million in 2018. REPP was established with a five-year goal of improving energy access for at least two million people in Sub-Saharan Africa. It has so far invested around $ 45 million to renewable energy projects in 13 countries in Sub-Saharan Africa . Solar power and hydropower are among

1656-650: The World Conservation Monitoring Centre , based in Cambridge and sponsored by IUCN , became part of UNEP. In December 1972, the UN General Assembly unanimously elected Maurice Strong to be the first head of UN Environment. He was also secretary-general of both the 1972 United Nations Conference on the Human Environment and the Earth Summit (1992). The position was then held for 17 years (1975–1992) by Mostafa Kamal Tolba , who

1725-903: The World Meteorological Organization and UNEP established the Intergovernmental Panel on Climate Change (IPCC). UNEP is also one of several Implementing Agencies for the Global Environment Facility (GEF) and the Multilateral Fund for the Implementation of the Montreal Protocol . UNEP sometimes uses the alternative name UN Environment. The headquarters of the agency is in Nairobi, Kenya. In

1794-583: The 'Hockey Stick' as the new orthodoxy with hardly an apology or explanation for the abrupt U-turn since its 1995 report". Criticism of the MBH99 reconstruction in a review paper, which was quickly discredited in the Soon and Baliunas controversy , was picked up by the Bush administration, and a Senate speech by US Republican senator James Inhofe alleged that "manmade global warming is the greatest hoax ever perpetrated on

1863-443: The 1970s, the need for environmental governance at a global level was not universally accepted, particularly by developing nations. Some argued that environmental concerns were not a priority for nations in poverty. The leadership of Canadian diplomat Maurice Strong convinced many of the developing nations' governments that they needed to prioritize this issue. In the words of Nigerian professor Adebayo Adedeji : "Mr. Strong, through

1932-409: The 1987 Montreal Protocol for limiting emissions of gases blamed for thinning the planet's protective ozone layer, and the 2017 Minamata Convention , a treaty to limit toxic mercury. UNEP has sponsored the development of solar loan programmes, with attractive return rates, to buffer the initial deployment costs and entice consumers to consider and purchase solar PV systems . The most famous example

2001-694: The 2007 publication of the Intergovernmental Panel on Climate Change Fourth Assessment Report , the Paris Call for Action , presented by French president Jacques Chirac and supported by 46 countries, called for the UNEP to be replaced by a new and more powerful "United Nations Environment Organization", to be modeled on the World Health Organization . The 46 countries included the European Union nations, but notably did not include

2070-585: The 40 SRES scenarios. Some authors have argued that some SRES scenarios are more likely to occur than others. The IPCC is backed by the scientific community. For example, a joint statement of support was issued in May 2001 by the science academies of Australia, Belgium, Brazil, Canada, the Caribbean, China, France, Germany, India, Indonesia, Ireland, Italy, Malaysia, New Zealand, Sweden and the UK. It states: "We recognise

2139-481: The 9–88 cm as projected by the IPCC itself in its Third Assessment Report, published in 2001". This may have been due, in part, to the expanding human understanding of climate. Greg Holland from the National Center for Atmospheric Research , who reviewed a multi-meter sea level rise study by Jim Hansen , noted " There is no doubt that the sea level rise, within the IPCC, is a very conservative number, so

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2208-460: The American people". The data and methodology used to produce the "hockey stick graph" was criticized in papers by Stephen McIntyre and Ross McKitrick , and in turn the criticisms in these papers were examined by other studies and comprehensively refuted by Wahl & Ammann 2007 , which showed errors in the methods used by McIntyre and McKitrick. On 23 June 2005, Rep. Joe Barton , chairman of

2277-609: The EAC (2005). The third assessment report (TAR) prominently featured a graph labeled "Millennial Northern Hemisphere temperature reconstruction" based on a 1999 paper by Michael E. Mann , Raymond S. Bradley and Malcolm K. Hughes (MBH99), which has been referred to as the " hockey stick graph ". This graph extended the similar graph in Figure 3.20 from the IPCC Second Assessment Report of 1995, and differed from

2346-460: The IPCC as the world's most reliable source of information on climate change and its causes, and we endorse its method of achieving consensus." In 2001, the executive branch of the US federal government asked the US National Research Council (US NRC, 2001) to produce an assessment of climate change science. Part of the assessment by US NRC (2001) looks at the report produced by Working Group I (WG I) in

2415-430: The IPCC has developed. In 2000, the IPCC published 40 different scenarios (the " SRES" scenarios ) which contain estimates of future changes in anthropogenic emissions of greenhouse gases and aerosols. The SRES scenarios project a wide range of possible changes in future social and economic development, and projected climate change impacts vary according to the scenario considered. The IPCC has not assigned probabilities to

2484-434: The IPCC report. These studies were widely presented as demonstrating that the current warming period is exceptional in comparison to temperatures between 1000 and 1900, and the MBH99 based graph featured in publicity. Even at the draft stage, this finding was disputed by contrarians: in May 2000 Fred Singer 's Science and Environmental Policy Project held a press event on Capitol Hill, Washington, D.C., featuring comments on

2553-637: The IPCC's work, including the " SRES " greenhouse gas emissions scenarios, which are used in the TAR. The Economic Affairs Select Committee is made up of members of the House of Lords , which scrutinizes and votes on government legislation. One of the criticisms made by the EAC (2005) is an apparent inconsistency between the Working Group II Summary for Policymakers and a statement made in the full WGII report: "The IPCC Summary for policy makers says that economic studies underestimate damage, whereas

2622-698: The International Environmental Education Programme (1975–1995), which set out a vision for, and gave practical guidance on how to mobilize education for environmental awareness. In 1976 UNESCO launched an environmental education newsletter Connect as the official organ of the UNESCO-UNEP International Environmental Education Programme (IEEP). Until 2007 it served as a clearinghouse to exchange information on environmental education in general and to promote

2691-553: The Norwegian Institute of International Affairs said the freezing of funds was probably unprecedented. [REDACTED]  This article incorporates text from a free content work. Licensed under CC BY-SA ( license statement/permission ). Text taken from Issues and trends in Education for Sustainable Development​ , 26, 27, UNESCO. Academy of sciences An academy of sciences

2760-476: The SPM is a "reasonably balanced summary". US NRC (2001) concluded that the WGI SPM and Technical Summary are "consistent" with the full WGI report. US NRC (2001) stated: ... the full [WGI] report is adequately summarized in the Technical Summary. The full WGI report and its Technical Summary are not specifically directed at policy. The Summary for Policymakers reflects less emphasis on communicating

2829-720: The TAR include: The following tables are adapted from Chapter 6 of the Working Group 1 report. (J kg) (Wm) Projections are used in the TAR as a guide to the possible future effects of climate change , e.g., changes in global mean temperature and sea level. In the TAR, the word "projection" is favoured over "prediction". This is because many future changes related to climate are highly uncertain. For example, climate change projections are affected by highly uncertain changes in future GHG emissions. The TAR projects impacts according to possible future changes in global mean temperature. Other projections are based on scenarios that

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2898-460: The TAR. Working Group I's contribution to the TAR assesses the physical scientific aspects of the climate system and climate change. US NRC (2001) generally agrees with findings of the WG I report, for example, US NRC (2001) state that "[the] IPCC's conclusion that most of the observed warming of the last 50 years is likely to have been due to the increase in greenhouse gas concentrations accurately reflects

2967-630: The United States, Saudi Arabia, Russia, and China, the top four emitters of greenhouse gases . In December 2012, following the Rio+20 Summit, a decision by the General Assembly of the United Nations to "strengthen and upgrade" the UNEP and establish universal membership of its governing body was confirmed. In other words, it was reorganized by applying the existing executive member system (58 member states) from 1973 to 2013 to

3036-502: The aims and activities of the IEEP in particular, as well as being a network for institutions and individuals interested and active in environment education. Climate change In 1989, UNEP published a statement predicting that "entire nations could be wiped off the face of the Earth by sea level rise if the global warming trend is not reversed by the year 2000". In 2005, UNEP issued

3105-586: The areas of social sciences and humanities. As the engineering sciences have become more varied and advanced, there is a recent trend in many advanced countries to organize the National Academy of Engineering (or National Academy of Engineering Sciences), separate from the national academy of sciences. Academies of science play an important role in science diplomacy efforts. Academies are increasingly organized in regional or even international associations. The Interacademy Partnership for example

3174-410: The basis for uncertainty and a stronger emphasis on areas of major concern associated with human-induced climate change. This change in emphasis appears to be the result of a summary process in which scientists work with policy makers on the document. Written responses from U.S. coordinating and lead scientific authors to the committee indicate, however, that (a) no changes were made without the consent of

3243-458: The chapter says the direction of the bias is not known." The UK Government issued a response to the report by EAC (2005). The UK Government acknowledged the discrepancy between the WGII SPM and full WGII report which was referred to by the EAC (2005), but remained generally supportive of the IPCC's procedures. The UK Government rebutted a number of other criticisms of the TAR which were made by

3312-636: The convening lead authors (this group represents a fraction of the lead and contributing authors) and (b) most changes that did occur lacked significant impact. There are a small number of climate scientists who disagree with aspects of the IPCC's work. Perhaps the best known is Richard Lindzen , professor of meteorology at the Massachusetts Institute of Technology . A report by the UK Parliament 's House of Lords Economic Affairs Select Committee (EAC, 2005) contains criticisms of

3381-513: The core source of UNEP's programs. Between 1974 and 1986 UNEP produced more than 200 technical guidelines or manuals on environment including forest and water management, pest control , pollution monitoring, the relationship between chemical use and health, and management of industry. The location of the headquarters proved to be a major controversy, with developed countries preferring Geneva , where several other UN offices are based, while developing countries preferred Nairobi, as that would be

3450-471: The current thinking of the scientific community on this issue." US NRC (2001) emphasise the need for governments to have a good understanding of uncertainties in climate change science. The example cited by US NRC (2001) is the uncertainty over future changes in GHG emissions, which may be less or more than that projected by the TAR. US NRC (2001) also state: The most valuable contribution U.S. scientists can make

3519-623: The energy methods used in the projects. In September 2018, a series of allegations were made against the executive director of the UNEP, Eric Solheim, at that time, including excessive number of days spent outside the headquarters in Nairobi, Kenya. As a result, Eric Solheim resigned. Several donor countries withdrew their donation in the aftermath of the allegation, including the Dutch government who announced it would withhold $ 8 million in funding to UNEP until nepotism issues were resolved. Sweden and Denmark stopped funding as well. A spokesman for

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3588-444: The environmental field. The Global 500 Roll of Honour was initiated in 1987 and ended in 2003. Its 2005 successor, Champions of the Earth , and a similar award, Young Champions of the Earth , are given annually to entrepreneurs, scientists, policy leaders, upcoming talent, individuals and organizations who make significant positive impacts on resources and the environment in their areas. UNEP has registered several successes, such as

3657-545: The fifth Magdeburg Environmental Forum held in 2008, in Magdeburg , Germany, UNEP and car manufacturer Daimler AG called for the establishment of infrastructure for electric vehicles . At this international conference 250 politicians and representatives of non-government organizations discussed future road transportation under the motto of "Sustainable Mobility–the Post-2012 CO 2 Agenda". Circular economy UNEP

3726-478: The first international organization headquartered in the Global South . At first, Mexico City , New Delhi , and Cairo were also competing to be the headquarters, but they pulled out to support Nairobi. Many of the developing countries were "not particularly supportive of creating a new formal institution for environmental governance", but supported its creation as an act of "Southern solidarity". In 2000,

3795-406: The graph Wibjörn Karlén and Singer argued against the graph at a United States Senate Committee on Commerce, Science and Transportation hearing on 18 July 2000. Denialist John Lawrence Daly featured a modified version of the IPCC 1990 schematic, which he mis-identified as appearing in the IPCC 1995 report, and asserted that "Overturning its own previous view in the 1995 report, the IPCC presented

3864-426: The health of almost 30 glaciers around the world found that ice loss reached record levels in 2006. On average, the studied glaciers shrank by 4.9 feet in 2006. Norway 's Breidalblikkbrea glacier shrank 10.2 feet in 2006. Glaciers lost an average of about a foot of ice a year between 1980 and 1999, but since the turn of the millennium the average loss has increased to about 20 inches. Electric vehicles At

3933-474: The marsh had been lost. The UNEP "support for environmental management of the Iraqi Marshland" began in 2004, to manage the marshland area in an environmentally sound manner. UNEP has a programme for young people known as Tunza. Within this programme are other projects like the AEO for Youth . UNEP uses its position to raise awareness for a range of issues. International Environmental Education Programme (1975–1995) For two decades, UNESCO and UNEP led

4002-416: The maximum it showed for the Medieval Warm Period did not reach temperatures recorded in central England in 2007. The MBH99 finding was supported by cited reconstructions by Jones et al. 1998 , Pollack, Huang & Shen 1998 , Crowley & Lowery 2000 and Briffa 2000 , using differing data and methods. The Jones et al. and Briffa reconstructions were overlaid with the MBH99 reconstruction in Figure 2.21 of

4071-822: The oceans and seas at the regional level. More than 143 countries participate in 18 regional programmes established by the Regional Seas Conventions and Action Plans, with 14 of them underpinned by legally binding international conventions, such as the Helsinki Convention , the Oslo Dumping Convention , the Barcelona Convention or the Bucharest Convention. The RSCAPs include the Caribbean region , East Asian seas, East African region, Mediterranean Basin , Pacific Northwest region, West African region, Caspian Sea , Black Sea region, Northeast Pacific region, Red Sea and Gulf of Aden , ROPME Sea Area, South Asian seas, Southeast Pacific region, Pacific region, Arctic region, Antarctic region, Baltic Sea , and Northeast Atlantic region. Each programme consists of countries which share

4140-600: The resignation of Erik Solheim . Prior to that appointment, she was UNEP's deputy executive director. Inger Andersen was appointed executive director of UNEP by UN secretary-general António Guterres in February 2019. (acting) (born 1968) The United Nations Environment Assembly is UNEP's governing body. Created in 2012 to replace the Governing Council, it currently has 193 members and meets every two years. UNEP's structure includes eight divisions: UNEP's main activities are related to: Several awards programs have been established to recognize outstanding work in

4209-444: The same sea and manages this sea at the regional level. The programmes are controlled by secretariats or Regional Coordinating Units and Regional Activity Centers. UNEP protects seas by promoting international conventions through education and training. Launched in 2017, the initiative's goal is to encourage and collaborate with faith-based organizations to protect the environment and invest in green resources. In 2020, UNEP published

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4278-416: The sea level is projected to rise by 0.1 to 0.9 metres over the same period. The wide range in projections is based upon several different scenarios that assume different levels of future CO 2 emissions (see the section below on Projections in the TAR ). The TAR Synthesis Report includes a summary of the TAR's main findings and uncertainties. "Robust findings" of the TAR include: "Key uncertainties" in

4347-622: The sincerity of his advocacy, soon made it clear that all of us, irrespective of the stage of our development, have a large stake in the matter." After developing organisations such as the International Labour Organization , the Food and Agriculture Organization and the World Health Organization , the 1972 United Nations Conference on the Human Environment (the Stockholm Conference) was convened. In this conference various topics were discussed such as pollution, marine life, protection of resources, environmental change, and disasters relating to natural and biological change. This conference resulted in

4416-399: The time, US$ 40 million were pledged by the United States and the remainder by 50 other nations. The 'Voluntary Indicative Scale of Contribution' established in 2002 has the role to increase the supporters of the UNEP. The finances related to all programs of UNEP is voluntarily contributed by Member states of the United Nations . The Environmental Fund, which all nations of UNEP invest in, is

4485-497: The truth lies somewhere between IPCC and Jim. " The Third Assessment Report consists of the following reports from each of the three Working Groups, and a Synthesis Report. On-line text and PDFs are available at GRID-Arendal (a collaborating centre of the United Nations Environment Programme (UNEP) ). Additional reports and documents can be found at the IPCC's documents web page . United Nations Environment Programme The United Nations Environment Programme ( UNEP )

4554-521: The uncertainties were "the point of the article". An example of scientific research which suggests that previous estimates by the IPCC, far from overstating dangers and risks, have actually understated them is a study on projected rises in sea levels. When the researchers' analysis was "applied to the possible scenarios outlined by the Intergovernmental Panel on Climate Change (IPCC), the researchers found that in 2100 sea levels would be 0.5–1.4 m [50–140 cm] above 1990 levels. These values are much greater than

4623-402: The verb 'know', such as German Wissenschaft , Swedish vetenskap , Hungarian tudomány , Estonian teadus or Finnish tiede .) Accordingly, for example the Austrian Academy of Sciences ( Österreichische Akademie der Wissenschaften ), the Hungarian Academy of Sciences ( Magyar Tudományos Akadémia ), or the Estonian Academy of Sciences ( Eesti Teaduste Akadeemia ) also cover

4692-506: Was instrumental in bringing environmental considerations to the forefront of global thinking and action. Under his leadership, UN Environment's most widely acclaimed success—the historic 1987 agreement to protect the ozone layer —the Montreal Protocol was negotiated. He was succeeded by Elizabeth Dowdeswell (1992–1998), Klaus Töpfer (1998–2006), Achim Steiner (2006–2016), and Erik Solheim (2016–2018). UNEP's acting executive director, Joyce Msuya , took office in November 2018 following

4761-419: Was made by the Australian Academy of Science , the Royal Flemish Academy of Belgium for Science and the Arts , the Brazilian Academy of Sciences , the Royal Society of Canada , the Caribbean Academy of Sciences , the Chinese Academy of Sciences , the French Academy of Sciences , the German Academy of Natural Scientists Leopoldina , the Indian National Science Academy , the Indonesian Academy of Sciences ,

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