Associated Press: A South African climate negotiator says four major developing nations have presented a joint climate proposal ahead of a U.N. conference on global warming. Alf Wills says the document by China, India, Brazil and South Africa represents “different positions” compared to a separate outline for the global climate talks by Denmark, which will host the Dec. 7-18 conference. Wills said the joint document was presented at a preparatory meeting between negotiators in Copenhagen on …