As climate conference heats up in Bali on who should cut emissions by how much, the US has come up with a bargaining chip.

America is the only developed nation, which has rejected the Kyoto protocol.

The American senate has passed a new legislation, which aims to cut emissions by as much as 60 per cent by 2050.

It's hugely ambitious, but the US hopes to ward off controversy at Bali, where it will come face to face with criticism for being the world's biggest carbon emitter.

But more than that, the US hopes to bully India and china into cutting emissions as well.

''There is no comparison between the emissions of countries like India and China and big rich emitters of the world. Stock of greenhouse gases in the atmosphere was built over centuries in the process of creating wealth. This is the natural debt of these nations that they need to pay,'' said Sunita Narain, Director, CSE,

At Bali pressure is going to build on emerging economies like India and China to cut their green house gas emissions. And the challenge before India will be to use hard facts that put the developed nations in the dock to their advantage.