Barack Obama

EPA puts forward tough new air quality standards that would force local authorities to reduce smog levels

He Yafei shifted from position in foreign ministry after clashing with Obama and Merkel at Copenhagen

Last ditch effort to salvage agreement as Obama meets with Wen Jiabao

Leaked documents reveal negotiations are heading for staggeringly weak agreement

Confusion reigns as UN Secretary-General reportedly asks world leaders to extend their stay in Copenhagen in last-ditch effort to reach agreement

US President Barack Obama this morning addressed the Climate Change Summit in Copenhagen - here is his speech in full

US president insists movement is needed on all sides to reach workable accord

Huge increase in tax breaks proposed for manufacturers in the wind, geothermal and solar sectors in the US as part of wider job creation programme

As Google debuts new deforestation tracking tool, president's backing for REDD plan increases chances of forest protection deal

White House negotiating team promises "robust engagement", takes tough stance on China