Thousands of scientists contest the climate scare

2022: No Consensus on Climate Crisis, Scientist Survey Finds - The Heartland Institute

2019: The European Climate Declaration - Oslo: This declaration, signed by hundreds of individuals, stated that there is "no climate emergency" and also called for a more balanced approach to climate policy.

2018: Climate Scientists' Register | ICSC - Canada, signed by 143 scientists from 22 countries who have studied the causes of climate change and agree with the following statement: "We, the undersigned, having assessed the relevant scientific evidence, do not find convincing support for the hypothesis that human emissions of carbon dioxide are causing, or will in the foreseeable future cause, dangerous global warming."

2016:The Australian Climate Declaration: A group of scientists and professionals in Australia signed this declaration questioning the evidence for human-driven climate change.

2010: Science and Public Policy Institute (SPPI) letter to the U.S. EPA--signed by 35 climate and related experts supporting challenges by the US Chamber of Commerce and three states which question the basis for the 2009 "Endangerment Finding" under the Clean Air Act.

2008– 2019 - The Nongovernmental International Panel on Climate Change (NIPCC) Reports: While not a single letter, these reports are often cited by realists as counterpoints to the IPCC's findings. Here are the NIPCC reports in which thousands of peer-reviewed papers are cited casting doubt on the climate catastrophe hypothesis:

• Fossil Fuels (2019)
  • Summary of CCR II: Fossil Fuels
  • Full Text of CCR II: Fossil Fuels
• Why Scientists Disagree About Global Warming (2016)
  • Why Scientists Disagree About Global Warming
• Biological Impacts (2014)
  • Summary of CCR II: Biological Impacts
  • Full Text of CCR II: Biological Impacts
• Physical Science (2013)
  • Summary of CCR II: Physical Science
  • Full Text of CCR II: Physical Science
• Interim Report (2011)
  • Summary of CCR: Interim Report
  • Full Text of CCR: Interim Report
• NIPCC Report (2009)
  • Summary of Climate Change Reconsidered
  • Full Text of Climate Change Reconsidered
• Science and Environmental Policy Project SEPP/Heartland document Nature, Not Human Activity, Rules the Climate (2008) Summary for Policymakers of the Report of the NIPCC

2009: Cato Institute newspaper ad campaign letter (right); 115 scientist signers. The letter focused on skepticism about the urgency of climate action and questioned the reliability of climate models and predictions. It was published as an open letter in major newspapers to influence public opinion and policy discussions on climate change.

2009: Copenhagen Climate Challenge which listed 166 experts well qualified in climate science plus some in 'other related disciplines'. Sent during the Copenhagen Climate Change Conference, this letter emphasized doubts about the science underpinning human-caused climate change.

2009: Open Letter to the Council of the American Physical Society-signed by 61 experts, expressed skepticism about the supposed scientific consensus on climate change. The letter called for APS to change its official statement on climate change, arguing that it overstated the certainty of human impact on global warming. The signatories advocated for a more open and balanced discussion on climate change, emphasizing the need for scientific rigor and debate.

2009:The Cornwall Alliance's Evangelical Declaration on Global Warming: Rooted in religious perspectives, this declaration expressed skepticism about catastrophic climate change and emphasized stewardship of the Earth.

2008: THE MANHATTAN DECLARATION ON CLIMATE CHANGE, 1,497 endorsers, over half of them well qualified in science and technology and 206 of them climate science specialists or scientists in very closely related fields . Released after The Heartland Institute's climate realists' conference in New York City, it argued against the urgency of reducing greenhouse gas emissions.