The U.N.'s own observations show no warming trend, but things may still get hot and bothered in Poznan. Ten thousand people from 86 countries have descended upon Poznan, Poland, for yet another United Nations meeting on climate change. It’s the annual confab of the nations that signed the original United Nations climate treaty in Rio in 1992. That instrument gave rise to the infamous 1996 Kyoto Protocol on global warming, easily the greatest failure in the history of environmental diplomacy. Al Gore himself descends on Wednesday to personally bless the conclave’s work product — which, based on past history, we...