An Open Letter from Scientists in the United States on the Intergovernmental Panel on Climate Change and Errors Contained in the Fourth Assessment Report: Climate Change 2007

[Note: Over 250 scientists have already signed this open letter and signatures are still being collected. For a full list of signers please visit this page. On March 13, 2010, the letter was sent to federal agencies. The vast majority of the signers are climate change scientists who work at leading U.S. universities and institutions. They include both IPCC and non-IPCC authors. Additional signers include professionals from related disciplines, including physical, biological and social scientists. If you are a scientist wishing to sign the letter, please fill out the form on the this page. If you have any questions, please contact the letter’s authors, contact information is below.]

***********************************************

Many in the popular press and other media, as well as some in the halls of Congress, are seizing on a few errors that have been found in the Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change (IPCC) in an attempt to discredit the entire report. None of the handful of mis-statements (out of hundreds and hundreds of unchallenged statements) remotely undermines the conclusion that “warming of the climate system is unequivocal” and that most of the observed increase in global average temperatures since the mid-twentieth century is very likely due to observed increase in anthropogenic greenhouse gas concentrations. Despite its excellent performance for accurately reporting the state-of-the-science, we certainly acknowledge that the IPCC should become more forthcoming in openly acknowledging errors in a timely fashion, and continuing to improve its assessment procedures to further lower the already very low rate of error. ….more