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Here is the link to the AMETSOC official statement, cited in the letter. AMETSOC is hardly the only such professional scientific organization to do so.

• The statement of the American Geophysical Union. Not surprisingly, the AGU issued their own response to Administrator Pruitt’s comments.
• The statement of the Ecological Society of America jointly with 30 other scientific organizations.
• The statement of the American Association for the Advancement of Science, which is the same letter the ESA signed.
• The formal statement of the American Statistical Association, a technical article on climate and on climate change science authored by statisticians Richard L Smith, L Mark Berliner, and Peter Guttorp, from 2010, and a formal response to objections to that article and the formal position, also from 2010. See in particular the nice empirically-based discussion by Guttorp regarding the connection between carbon dioxide and climate change in the article by Smith-Berliner-Guttorp, highlighting a 1995 paper by Thomson which, as Guttorp remarks, “… provided the first strong evidence in favor of an observable greenhouse gas effect. Also notable is that the work was based primarily on a careful statistical analysis of the temperature series, rather than on climate models. To me, this paper was the first smoking gun that global warming is connected to the increase of CO₂ concentrations in the atmosphere.”

I am also a proud member of the American Statistical Association, in fact, and of ESA and AAAS as well.