Union of Concerned Scientists
Scientific societies and scientists have released statements and studies showing the growing consensus on climate change science. A common objection to taking action to reduce our heat-trapping emissions has been uncertainty within the scientific community on whether or not global warming is happening and if it is caused by humans. However, there is now an overwhelming scientific consensus that global warming is indeed happening and humans are contributing to it. Below are links to documents and statements attesting to this consensus.
Scientific Societies American Meteorological Society
Climate Change: An Information Statement of the American Meteorological Society
“Indeed, strong observational evidence and results from modeling studies indicate that, at least over the last 50 years, human activities are a major contributor to climate change.” (February 2007)
American Physical Society
Statement on Climate Change
“The evidence is incontrovertible: Global warming is occurring. If no mitigating actions are taken, significant disruptions in the Earth’s physical and ecological systems, social systems, security and human health are likely to occur. We must reduce emissions of greenhouse gases beginning now.” (November 2007)
American Geophysical Union
Human Impacts on Climate
“The Earth’s climate is now clearly out of balance and is warming. Many components of the climate system — including the temperatures of the atmosphere, land and ocean, the extent of sea ice and mountain glaciers, the sea level, the distribution of precipitation, and the length of seasons—are now changing at rates and in patterns that are not natural and are best explained by the increased atmospheric abundances of greenhouse gases and aerosols generated by human activity during the 20th century.” (Adopted, December 2003, Revised and Reaffirmed. December 2007)
American Association for the Advancement of Science
AAAS Board Statement on Climate Change
“The scientific evidence is clear: global climate change caused by human activities is occurring now, and it is a growing threat to society.” (December 2006)
Geological Society of America
Global Climate Change
“The Geological Society of America (GSA) supports the scientific conclusions that Earth’s climate is changing; the climate changes are due in part to human activities; and the probable consequences of the climate changes will be significant and blind to geopolitical boundaries.” (October 2006, reaffirmed, March, 2013)
American Chemical Society
Statement on Global Climate Change
“There is now general agreement among scientific experts that the recent warming trend is real (and particularly strong within the past 20 years), that most of the observed warming is likely due to increased atmospheric greenhouse gas concentrations, and that climate change could have serious adverse effects by the end of this century.” (July 2004)
U.S. National Academy of Sciences
Understanding and Responding to Climate Change
“The scientific understanding of climate change is now sufficiently clear to justify taking steps to reduce the amount of greenhouse gases in the atmosphere.” (2005)
International Academies
Joint science academies’ statement: Global response to climate change
“Climate change is real. There will always be uncertainty in understanding a system as complex as the world’s climate. However there is now strong evidence that significant global warming is occurring.” (2005, 11 national academies of science)
“Despite increasing consensus on the science underpinning predictions of global climate change, doubts have been expressed recently about the need to mitigate the risks posed by global climate change. We do not consider such doubts justified.” (2001, 16 national academies of science)