Negotiators Argue Under Hot Cancun Sun on Global Warming

Europe is gripped by bitter cold at the moment, but 2010 has been one of the hottest years in recorded history and carbon emissions may hit an all-time high. Against that background, another UN Climate Change Summit is under way in Cancun, with delegates eager to improve on last year's performance in Copenhagen. The summit has been going on for a week, but negotiations really don't get going until the end, says  Bryan Walsh, who reported from Copenhagen last week and who's on his way to Cancun for Time magazine.