Rarely has the chasm between global reality and global diplomacy loomed larger. Over the past several months the urgency of the climate threat has exploded as tipping points we thought were decades away pound at our doorways; we suffer on a daily basis the hottest weather in hundreds of thousands of years; an entire American city vanishes in flames, while one in Libyavanishes beneath a crumbling dam after a stronger-than-normal storm. At the same time, the economic benefits of rapid decarbonization have been spectacularly on display across the world, as China…