he American Association for the Advancement of Science (AAAS) has reaffirmed the position of its Board of Directors and the leaders of 18 respected organizations, who concluded based on multiple lines of scientific evidence that global climate change caused by human activities is now underway, and it is a growing threat to society.

“The vast preponderance of evidence, based on years of research conducted by a wide array of different investigators at many institutions, clearly indicates that global climate change is real, it is caused largely by human activities, and the need to take action is urgent,” said Alan I. Leshner, chief executive officer of AAAS and executive publisher of the journal Science.

That’s from the AAAS press release.  The headline quotes come from the reaffirmed December 2006 statement (here).

The AAAS was one of the 18 leading scientific organizations that sent a letter to Senators affirming the climate is changing, “human activities are the primary driver,” impacts are projected to worsen “substantially” and “If we are to avoid the most severe impacts of climate change, emissions of greenhouse gases must be dramatically reduced.”


AAAS expressed grave concerns that the illegal release of private emails stolen from the University of East Anglia should not cause policy-makers and the public to become confused about the scientific basis of global climate change. Scientific integrity demands robust, independent peer review, however, and AAAS therefore emphasized that investigations are appropriate whenever significant questions are raised regarding the transparency and rigor of the scientific method, the peer-review process, or the responsibility of individual scientists. The responsible institutions are mounting such investigations….

“AAAS takes issues of scientific integrity very seriously,” Leshner said. “It is fair and appropriate to pursue answers to any allegations of impropriety. It’s important to remember, though, that the reality of climate change is based on a century of robust and well-validated science.”

The AAAS has joined many recent scientific institutions in reasserting the science in the wake of the swifthack affair: