5⃣The problem, of course, is that 25 years of climate diplomacy has shown little or no effect on CO2 emissions growth. Insanity, as is said, is doing the same thing over and over and expecting a different result. Climate policy is insane. pic.twitter.com/QyEoCrMnDR

— Roger Pielke Jr. (@RogerPielkeJr) February 9, 2018