Reuters: The world is within striking distance of a U.N. deal to curb greenhouse gas emissions enough to avoid the worst effects of global warming, a U.N. report said on Sunday as delegates gathered for climate talks in Copenhagen. “For those who claim that a deal in Copenhagen is impossible: they are simply wrong,” Achim Steiner, head of the U.N. Environment Programme (UNEP), said as delegates gathered for December 7-18 talks on a new deal to succeed the Kyoto Protocol. “We are in …