This report — Not Just a Number: Achieving a CO2 Concentration of 350 ppm or Less To Avoid Catastrophic Climate Impacts — was released by 350.org and the Center on Biological Diversity during the run-up to the Cancun conference in late 2010. It was widely circulated, particularly to delegates, at the Tianjin meeting in October, as a backgrounder for the discussion of the long term goal.
Not Just a Number is a nice, and very accessible review of the scientific evidence in support of a long-term global goal of 350 ppm. And it quite underscores the need for a renewed sense of urgency in the negotiations. Greenhouse Development Rights thus finds an appropriate place here, as an effort-sharing framework appropriate to an urgent response. If we ever get around to one.
