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the opposition within America is potentially substantial, and might be hardened if Obama looks like he is presenting Congress with a fait accompli.There are thought to be as many as 15 Democratic senators who represent "rust-belt" states dependent on coal mining, steel production and heavy manufacturing, all big emitters of carbon.

There have also been suggestions that the cost of any climate change legislation may be higher than the $646bn (£444bn) suggested by the Obama administration.

"We are at the low end of the production line for the global economy," he said. "We produce products and these products are consumed by other countries, especially the developed countries. This share of emissions should be taken by the consumers but not the producers," he said.

Mr Li also criticised proposals by the US to place carbon tariffs on goods imported from countries that do not limit those gases blamed for a rises in global temperatures. "If developed countries set a barrier in the name of climate change for trade, I think it is a disaster," Mr Li said.

Working out quite how to put Mr Li's suggestion into practice would be a logistical nightmare, other delegates in Washington said, even if the idea was ever agreed in principle. Asking importers to handle emissions "would mean that we would also like them to have jurisdiction and legislative powers in order to control and limit those," top EU climate negotiator Artur Runge-Metzger said.

Japan's chief negotiator Shinsuke Sugiyama pointed out that whatever deal emerged from Copenhagen, it was vital that it involved the US and China this time around. "Japan will not repeat Kyoto," Mr Sugiyama said. "At Kyoto we were not able to involve the biggest emitters in the world by now - and that means the United States of America and China," he said.

His comments echoed the message from Chinese officials. Su Wei, a senior negotiator, told the Guardian last month that the US had made a "substantive change" under the Obama administration."The message we have got is that the current US administration takes climate change seriously, that it recognises its historical responsibility and that it has the capacity to help developing countries address climate change," Su said.

"China used to think the developed world is not serious. That's what they were saying [at UN talks] in December," he said. "But now they know the US is on the pitch and ready to engage with them. It has made a real difference to what China is saying."

Miliband said he was encouraged by the change in tone since late last year in the country that emits more greenhouse gases than any other. "I think they're up for a deal. I get the strong impression that they want an agreement," he told the Guardian."They see the impact of climate change on China and they know the world is moving towards a low-carbon economy and see the business opportunities that will come with that."

China wants developed nations to commit to more ambitious reduction targets, to share low-carbon technology and to set up a UN fund that would buy related intellectual property rights for use across the world. Beijing's position is complicated by the fact that it already owns a large share of the patents for wind and solar energy in developed nations.

Europe and the US accept the Chinese economy should be allowed to grow further, improving the living standards of its millions of poor, before it makes overall emissions reductions. Instead, the western nations are pushing for strong measures to improve efficiency and establish caps for certain industries. One possibility being considered by Chinese officials is to set a carbon intensity goal up to 2040 that would include energy efficiency, renewable energy, transport and afforestation.

Last month, the Tyndale centre published research showing that it was possible for China to begin reducing its total emissions from 2020.Government officials say that is unrealistic and China has so far resisted announcing a target for when emissions might peak. But the authorities tend towards the later end of the various academic forecasts of between 2020 and 2040.

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."