Got this via Joe Romm's Climate Progress blog, originally from the inimitable Tom Toles.
Read the blog comments, and also this Romm post from James Hansen last summer.
Apologies to John Donne.

"All across the world, in every kind of environment and region known to man, increasingly dangerous weather patterns and devastating storms are abruptly putting an end to the long-running debate over whether or not climate change is real. Not only is it real, it's here, and its effects are giving rise to a frighteningly new global phenomenon: the man-made natural disaster." - Sen. Barack Obama, (D-IL), 3 April 2006
"We have many advantages in the fight against global warming, but time is not one of them. Instead of idly debating the precise extent of global warming, or the precise timeline of global warming, we need to deal with the central facts of rising temperatures, rising waters, and all the endless troubles that global warming will bring. We stand warned by serious and credible scientists across the world that time is short and the dangers are great. The most relevant question now is whether our own government is equal to the challenge." - Sen. John McCain (R-AZ), 12 May 2008
"We really don't have a policy [on climate change]. There's a lot of rhetoric and not a lot of action." - Rep. Mark Udall (D-CO), 10 July 2002
"Much of the debate over global warming is predicated on fear, rather than science." - Sen. James Inhofe (R-OK)
“Global warming is indeed a scam, perpetrated by scientists with vested interests, but in need of crash courses in geology, logic and the philosophy of science." - Martin Keeley, Geologist
"What I'd do with the IPCC report is to put it in the trash can because that's all it's worth....carbon dioxide was an insignificant component of the earth's atmosphere and that, rather than being the purveyor of doom it is currently viewed as today, it is needed in order for plants to grow....'Mars' atmosphere is about 95 percent CO2 and has no global warming.” - Dennis Hollars, Astrophysicist
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