Indonesia ? The world’s top two polluters, the U.S. and China, say they are not ready to commit to mandatory caps on greenhouse gases.

But that’s not a worry to the organizers of this month’s U.N. climate conference, who say they only want to jump-start the world’s talks toward a new climate accord.

“This meeting is not about delivering a fully negotiated climate change deal, but it is to set the wheels in motion,” the U.N. climate chief, Yvo de Boer, said Sunday.

Presidents, prime ministers and environmental ministers prepared to join discussions on how to head off the impacts of rising temperatures, from rising oceans to deadly droughts and diseases.

“Reaching a conclusion even in two years is going to be very ambitious, let alone trying to achieve that kind of result in two weeks,” de Boer said.

The main negotiating text for the Dec. 3-14 meeting on the Indonesian island of Bali mentions targets for reducing the amount of pollutants pumped into the atmosphere, but in a nonbinding way. The text was obtained by The Associated Press on Saturday.