Barack Obama

Ambitious hydrogen and carbon capture clean coal project back on the cards after Obama administration announces over $1bn in new funding

Some 17,000 US-made fuel-efficient vehicles now in operation in federal fleet

Republicans place greater emphasis on nuclear energy and further domestic oil exploration

Green groups furious over administration's failure to block controversial mountaintop mining projects

Electric cars take another step towards the mainstream as auto giant buys into emerging market

President sets out tough new standards designed to cut annual car emissions by 900 metric tons

Obama could seal accord on cutting emissions by autumn

Emission targets watered down to secure support of wavering Democrats, as backers insist bill could still pass this year

Republicans block Obama's nominee for Interior Department appointment in show of anger at administration's efforts to tighten oil and gas regulations

White House downplays memo suggesting concerns over EPA's endangerment finding