Associated Press: Climate negotiators from the world’s biggest polluters clashed over how deeply to cut emissions of heat-trapping gases, but decided to hold new talks aimed at reaching an accord. They also agreed on the enormity of their task. French President Nicolas Sarkozy, addressing the negotiators on Friday, warned that global warming is threatening food supplies and risks sparking a dozen Darfur-like conflicts – involving displaced, starving populations – around the world. A South …