This article is about scientific opinion on climate change. For public perception and controversy about the scientific consensus, see Public opinion on climate change and Global warming controversy. For opinions of individual dissenting scientists, see List of scientists opposing the mainstream scientific assessment of global warming.
Scientific opinion on climate change is given by synthesis reports, scientific bodies of national or international standing, and surveys of opinion among climate scientists. Individual scientists, universities, and laboratories contribute to the overall scientific opinion via their peer reviewed publications, and the areas of collective agreement and relative certainty are summarised in these high level reports and surveys. Self-selected lists of individuals’ opinions, such as petitions, are not normally considered to be part of the scientific process. National and international science academies and scientific societies have assessed the current scientific opinion, in particular on recent global warming. These assessments have largely followed or endorsed the Intergovernmental Panel on Climate Change (IPCC) position of January 2001 which states:
No scientific body of national or international standing has maintained a dissenting opinion; the last was the American Association of Petroleum Geologists, which in 2007 updated its 1999 statement rejecting the likelihood of human influence on recent climate with its current non-committal position. Some other organisations also hold non-committal positions Joint science academies’ statementsSince 2001, 32 national science academies have come together to issue joint declarations confirming anthropogenic global warming, and urging the nations of the world to reduce emissions of greenhouse gases. The signatories of these statements have been the national science academies:
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