UPDATE 1-Major developing nations must peak CO2 by 2020-IEA

* Major developing nations and Russia must peak CO2 in 2020

* Far more ambitious goal than offered in U.N. climate talks

(Recasts with quotes)

By David Fogarty and Gerard Wynn

BANGKOK/LONDON, Oct 6 (Reuters) - Carbon emissions from a group of richer developing nations including Russia, China, Brazil and the Middle East must stop growing by 2020 to control global warming, the International Energy Agency said on Tuesday.

The estimate is far more ambitious than goals offered by emerging economies such as China in United Nations talks meant to agree a new climate pact in Copenhagen in December.

China -- the world's biggest carbon emitter -- on Monday accused rich nations of "killing" the present Kyoto Protocol by proposing more flexible strategies for cutting their own greenhouse gas emissions, at preparatory two-week climate talks in Bangkok. [ID:nSP37539]

Carbon emissions will fall by as much as 3 percent this year, following the economic crisis, aiding the effort to cut carbon, said the IEA, which is an energy adviser to 28 industrialised countries.

"This gives us a chance to make real progress towards a clean-energy future, but only if the right policies are put in place promptly," said IEA Executive Director Nobuo Tanaka in a statement.