There could still be life after all in Copenhagen. President Obamas offer to reduce greenhouse gas emissions by 17 per cent could spur the climate change summit into some meaningful action, it is hoped.
The US president will make the offer when he addresses the Copenhagen climate change meet - the visit itself is touted as a highly positive symbolic gesture.
Officials said the US would pledge a 17% cut in emissions from 2005 levels by 2020, 30% by 2025, 42% by 2030 and 83% by 2050.
Mr Obama will outline a "pathway" towards the US goals at the summit, a White House statement said.
It described the cuts as "a significant contribution to a problem that the US has neglected for too long."
Obama, who campaigned on a pledge to tackle climate change, has been under pressure to attend the meeting and offer for the first time a 2020 reduction target. The U.S. has faced criticism for failing to enact legislation to limit heat-trapping pollution and create an emissions-trading market.
The president going to Copenhagen will give positive momentum to the negotiations, Michael Froman, Obamas deputy national security adviser for international economics, told reporters Wednesday. We think it will enhance the prospects for success.
But the White House qualified the 17 percent emissions reduction target by saying that it is tabled, "in the context of an overall deal in Copenhagen that includes robust mitigation contributions from China and the other emerging economies."