Even as the talking points of those who resist any response to global warming move from "it's not happening" through "it's not our fault" to "it's too late to do anything about it anyway," we still occasionally run into people who seem stuck at the first step, still stridently denying that climate disaster is happening, period (sadly, some of these folks are elected officials). Pointing them to careful descriptions of how we know what we know doesn't help; what we need is a point-by-point rebuttal of their tired (but oh-so-soundbyte-friendly) claims.
Coby Beck has done just that.
On his blog, A Few Things Ill-Considered, Coby is creating a guide to the science-grounded replies to the various denialist arguments. The material is good enough to get the full endorsement of the climate scientists at Real Climate -- and if it's good enough for them, it's good enough for us! The selections include "It's just natural variation," "a warmer climate is a good thing," "natural emissions dwarf human activity," and the old favorite, "global warming is a hoax!"
NRDC - http://www.nrdc.org/globalWarming/qthinice.asp - has a pretty sobering slide show on the subject; any got the link?
I've always found this little bit of basic physics helpful too: http://www.natlogic.com/resources/nbl/v05/n15.html