New realism? - the Royal Society ...

It seems that the Royal Society is looking beyond the optimistic 2 degree goal, and is beginning to analyse possible alternatives. When do we need to talk about 4 degrees? - See the theme issue 'Four degrees and beyond: the potential for a global temperature increase of four degrees and its implications' compiled and edited by Mark G. New, Diana M. Liverman, Richard A. Betts, Kevin L. Anderson and Chris C. West in Philosophical Transactions of the Royal Society (A; January 2011).