UPDATE: Brentbo sums it up nicely in comments: Global warming of 7C could kill billions this century. True, in the same sense that Tina Turner could have a kid by the pope.
This is more than twice what was expected in 2003. The Telegraph reports
“Global warming of 7C ‘could kill billions this century‘. Global temperatures could rise by more than 7C this century killing billions of people and leaving the world on the brink of total collapse, according to new research“A similar 2003 study had predicted a mere- but still significant- 4 degree increase in global temperatures by 2100, but those models weren’t nearly as comprehensive, and they didn’t take into consideration economic factors.