US Congress

EPA asserted authority to move forward without new laws from Congress at hearing where contrarian views were on display

Representatives approve bill declaring that controversial oil pipeline from Canada does not need president's permission

MIT physicist replaces Steven Chu with unanimous Senate backing

NRDC estimates $100bn was needed to deal with the aftermath of droughts, floods and fires in 2012, representing the biggest non-defence spend in the US budget

Climate Declaration secures 40th corporate signatory, as auto giant calls on Washington to deliver ambitious environmental policy

Campaign group aims to increase pressure on Republican climate deniers blocking Congressional action on emissions

Watered down bill aims to navigate Congressional barriers

Proposal to target most polluting facilities in America would raise $1.2trn, 60 per cent of which would be returned to bill payers

Senators Barbara Boxer and Bernie Sanders slated to unveil comprehensive climate change legislation following Presidential ultimatum

President pledges to take executive action to slash greenhouse gas emissions and outlines plan for new Energy Security Trust