A letter to Congress

Update, 22 October: Joe Romm noticed the letter. His conclusion? "Kudos to all those scientific organizations who did sign on!"

Earlier today the leaders of 18 scientific organizations delivered a letter to senators restating the consensus view on climate change.

[C]limate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver. These conclusions are based on multiple independent lines of evidence, and contrary assertions are inconsistent with an objective assessment of the vast body of peer-reviewed science. Moreover, there is strong evidence that ongoing climate change will have broad impacts on society, including the global economy and on the environment.

We¹ do not take a position on any particular legislation or policy proposals in this letter, although we do point out that "[i]f we are to avoid the most severe impacts of climate change, emissions of greenhouse gases must be dramatically reduced." Instead,

We in the scientific community offer our assistance to inform your
deliberations as you seek to address the impacts of climate change.

If you'd like to read the whole letter² and see the signatures, you can download the PDF. AIBS has also issued a press release about the letter.³ Here's a brief notice from ScienceInsider.