USA

Four jurisdictions agree to align low carbon policies, potentially paving way for carbon-trading scheme

Hardware is getting cheaper, but other costs are holding back solar energy - now a group of US startups are fighting to change that

Hurricane Sandy was a painful wake-up call on grid vulnerability that catalyzed investment in distributed energy and smart grid tech

Switch from coal to natural gas, nuclear, and renewables has pushed down emissions by 12 per cent since 2007 peak

US solar giant agrees to purchase key supplier of cost-saving rooftop installation kit

Reports suggest Supreme Court will meet again to mull raft of cases challenging legality of Obama administration's climate policies

Growing concerns over radiation risks as report finds widespread environmental damage on an unimaginable scale in the US

Lone Pine Resources says the Government of Quebec breached trade rules by passing a bill revoking all fracking permits in its territory

Co-author of study says UK must impose better environmental regulation than US if it pursues shale gas extraction

Manufacturer expands US Army programme to test new durable hydrogen fuel cell materials and designs