Reuters: The world is striving for a new U.N. climate "treaty" in December to succeed Kyoto. Or perhaps it will be a vaguer "agreement," "deal" or "decision." Delegates at 175-nation U.N. talks in Bonn on ways to step up the fight against global warming are locked in a semantic dispute — but a vital one which will determine how ambitious a new deal is and how far it can be enforced in international law. "It certainly has big legal implications," Yvo de Boer, head of the U.N. Climate …