More than 80 projects awarded tax credits as Department of Energy announces fresh $100m in green skills funding
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
Encouraging moves on climate funding, deforestation and the US climate bill are all overshadowed by increasingly fractious row over future of Kyoto Protocol