Lawmakers maintain climate vigil on Capitol Hill, warning of economic and human costs that could hit US in warmer world
US Secretary of State ignores recent criticism to ram home commitment to new UN climate deal
Final decision from President Obama expected in summer as battle over tar sands pipeline heats up
Influential diplomat says ambitious UN deal still on cards despite polarised atmosphere on Capitol Hill
New study reveals 66 countries now have legislation governing climate mitigation and adaptation plans
US Secretary of State follows up comments on climate action with call for more marine protection zones
Gina McCarthy says Administration is committed to more pollution cuts despite recent Supreme Court challenge
US President says fate of Keystone pipeline is still uncertain, as Republicans start new campaign against carbon cutting
New regulations scheduled for 2016 could cut carbon pollution in USA by 10% say Sierra Club
Secretary of State tells audience in Indonesia unlimited carbon emissions could create a ‘fearsome’ weapon
Early submission to UN reveals White House support for flexible deal involving developed and developing nations
Reports from Washington DC suggest Obama Administration has held series of meeting to discuss possible climate strategies
Presidents of France and USA issue statement ahead of summit to discuss economy, security and global warming
US Secretary of State tells security experts climate challenge requires “collective leadership”
Chicago Mayor Rahm Emanuel says energy efficiency drive will generate new jobs and boost economic productivity
President says he will use executive powers to curb use of coal, but defends plans to use more gas and oil
US president’s climate ambition faces tough test as mid-term elections and hostile Congress limit room to manouevre in 2014
US President tells Democrat fundraisers emerging economies hold key to addressing climate change
Frequency of most severe El Nino cycle could double, posing severe test for USA, Indonesia and Australia
Yale study reveals slight increase in climate scepticism as Republican Senators try to block emission reduction measures