From the Proceedings of the Royal Society: 4 degrees

Thanks to Will Sheftall for pointing this one out:
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  January 13, 2011; 369 (1934)
This is all one link:

http://rsta.royalsocietypublishing.org/gca?gca=roypta%3B369%2F1934%2F6&gca=roypta%3B369%2F1934%2F20&gca=roypta%3B369%2F1934%2F45&gca=roypta%3B369%2F1934%2F67&gca=roypta%3B369%2F1934%2F85&gca=roypta%3B369%2F1934%2F99&gca=roypta%3B369%2F1934%2F117&gca=roypta%3B369%2F1934%2F137&gca=roypta%3B369%2F1934%2F161&gca=roypta%3B369%2F1934%2F182&gca=roypta%3B369%2F1934%2F196&gca=roypta%3B369%2F1934%2F217&submit=Get+All+Checked+Abstracts