BALI Global Warming conference

Dec. 4 (Bloomberg) -- Cobbling a global treaty to slow the planet's warming may require an unprecedented agreement between the U.S. and China, the world's largest greenhouse gas polluters.

Delegates, lawmakers and scientists from 187 countries gathering in Bali, Indonesia, for the next two weeks aim to set a deadline for replacing the global warming treaty signed 10 years ago in Kyoto, Japan, that expires in 2012. The accord, which prescribes emissions cuts for industrialized nations, didn't require mandatory reductions for developing countries such as China, and the U.S. refused to sign it.