Climate Change 1 line rebuttals to deniers.

 if somebody raises the standard talking point (#1 on the list) that the “climate’s changed before,” you can say, “ Climate reacts to whatever forces it to change at the time; humans are now the dominant forcing.” That is actually quite similar to what was my standard response, “The climate changes when it is forced to change, and now humans are forcing it to change far more rapidly than it did in the past” (see “ Humans boosting CO2 14,000 times faster than nature, overwhelming slow negative feedbacks” and “ New Science Study Confirms ‘Hockey Stick’: The Rate Of Warming Since 1900 Is 50 Times Greater Than The Rate Of Cooling In Previous 5000 Years “).  Working in the “humans are now the dominant forcing” part is a good idea. 

http://www.alternet.org/environment/99-one-liners-rebut-climate-change-denier-talking-points?akid=10410.294211.ENUECe&rd=1&src=newsletter836553&t=18