Heading into the climate talks in Cancun, the UK's Royal Society has issued a report that shows the worst case scenario that we are on track for is having warming of 4 degrees C (or 7 degrees F) by 2060. Joe Romm calls it a "hellish vision" for the future. He notes that scientists are only now starting to study the worst case scenarios more intently:
In fairness, a key reason the scientific community hasn’t studied the high emissions scenarios much until recently because they never thought humanity would be so self-destructive as to ignore their warnings for so long, which has put us on the highest emissions path...
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[Apologies for the light posting - we are in the throes of year-end insanity.]