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 (IEA) said today.

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, reports Reuters.

China – the world’s biggest carbon emitter – has accused rich nations of ‘killing’ the present Kyoto Protocol by proposing more flexible strategies for cutting its own greenhouse gas emissions, at preparatory two-week climate talks in Bangkok.

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

The report, which is part of the IEA’s annual World Energy Outlook, said $10tn extra energy investment would be needed from 2010-2030 to control carbon emissions, or between half and 1% of global economic output, but that could be almost entirely made up from fuel savings following efficiency gains.