Bloomberg: The U.S. and China, the world’s two biggest emitters of greenhouse gases blamed for climate change, have two years to resolve differences blocking a new agreement to help slow the planet’s warming. After two weeks of talks concluding with three sleepless nights for negotiators, a scolding from UN Secretary-General Ban Ki-Moon, and public tears from the conference head, the 187 nations meeting on Bali in Indonesia agreed on a document setting a 2009 deadline for a new treaty to limit …