Barack Obama

President disappoints campaigners by signing bill into law that exempts US airlines from European carbon trading scheme

The climate has been back on Obama's lips since his re-election, but the Doha conference will show if he is all talk

Opposing campaigners call on president to end uncertainty over controversial pipeline linking US to Canadian tar sands

From Tories running in circles over wind policy to an M&S milestone, we run down the top stories from the past week

President uses first press conference since re-election to make personal commitment to deliver action on climate change

Marc Gunther explores whether President Obama's victory and looming fiscal cliff could open the door for a US carbon tax

Christiana Figueres welcomes re-election as UN launches initiative showcasing public-private green projects

President warns against the "destructive power of a warming planet" in victory speech

Mayor's endorsement could turn climate change into a serious election issue – and it might even embolden Republicans

Bill Clinton and Al Gore among those calling for fresh focus on issue that neither candidate mentioned in televised debates