FACTBOX: Main players at Bali climate talks

(Reuters) - The United Nations aims to launch a two-year drive at talks in Bali, Indonesia to bind rich and poor nations to a global fight against climate change.

But the problem will be finding a common formula.

The December 3-14 U.N. climate talks will pit China, India and other developing nations against industrial nations led by the United States, the world's top emitter of greenhouse gases. Poorer countries accuse Washington of failing to take the lead in cutting emissions and don't want to sacrifice economic growth.

Following are the negotiating platforms for the main groups at Bali.

UNITED NATIONS

The U.N.'s latest Human Development Report, released on Tuesday, included some of the strongest calls yet for collective action to avert catastrophic climate change, which would disproportionately affect the poor.

The authors called for industrialized nations to cut greenhouse gas emissions by 80 percent by 2050 from 1990 levels. Developing nations needed to cut emissions by 20 percent by 2050 from 1990 levels.

"The message for Bali is the world cannot afford to wait," Kevin Watkins, a senior research fellow at Britain's Oxford University and lead author of the report, told Reuters.

The United Nations wants the world to agree a new deal on climate change at a U.N. conference in Copenhagen in late 2009 after two years of negotiations starting in Bali.