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A second government adviser, Hu Angang, has said China should start cutting overall emissions from 2020.

While that is a minority view and final decisions are some way off, the proposals are striking because they are at odds with China's official negotiating stance.

Beijing has hitherto rejected carbon emission caps or cuts, arguing that its priority is to improve its people's living standards – and that the west caused the global warming problem and should fix it. But developed nations argue that they cannot commit to deep cuts and to substantial funding for developing nations to fight climate change unless those countries embrace emissions targets.

Environmental groups and foreign diplomats said a carbon intensity target would be a significant step forward. Any move by China, the world's fastest expanding major economy, biggest emitter of greenhouse gases and most influential developing nation, would have an enormous impact on the outcome of the Copenhagen summit in December."It would be a significant step for China to set a target that directly links carbon emissions to economic growth for the first time," said Yang Ailun of Greenpeace."This is a green shoot of pragmatism that should be nurtured," said one European diplomat.

Hu, an influential economist and advocate of "green revolution", is pressing the government to take a leadership role in Copenhagen by making a public commitment to reduce emissions, and last week submitted the proposal to set a new carbon dioxide goal.He is one of 37 members of an elite body that advised the premier, Wen Jiabao, to include ambitious targets of a 20% improvement in energy efficiency and 10% reduction of pollution in the 2006-2010 plan. With government figures suggesting the country is on course to approach or exceed those goals, Hu suggests they be extended for the next plan with the addition of the carbon dioxide target.

If his proposal is accepted, Hu believes China will be able to make an international pledge this year to reduce carbon dioxide emissions from 2020.

the debate on China's role in greenhouse gas reductions is widening. Last month, the Chinese Academy of Science reported that the country's carbon dioxide emissions relative to GDP should be reduced by 50% by 2020, and that total CO2 emissions should peak between 2030 and 2040 if the country introduced more stringent energy-saving policies and received more financial support and technology from overseas.

Citing new figures from the state bureau of energy, Hu said China overtook the US last year as the world's biggest energy producer with 2.6bn tonnes of standard coal equivalent, seven years ahead of expectations. "If we can't succeed in reducing energy consumption, then no one can. I tell the government that a 1% failure in China is a 100% failure for the world," said Hu. "We must satisfy our national interest and match it with the interest of humanity."