My friend Bill McKibben, climate campaigner extraordinaire (he blew the first public whistle with The End of Nature in the late 1980s) has been organizing internationally behind the notion that 350 parts per million (ppm) of carbon in the atmosphere is the absolute limit of what the earth can tolerate. The IPCC—the Intergovernmental Panel on Climate Change—in its latest report two years ago, set the number at 450. The current carbon load in the atmosphere is about 370 ppm and rising.
McKibben’s organization, 350.org, has been agitating for a lowering of the goal to 350 and on Aug. 25 got the welcome news that Chairman Rajendra Pachauri of the IPCC had given his personal endorsement to the 350 number. This, as Bill explained in an email, is a very big deal and governments everywhere should sit up, take notice, and get finally off their duffs.