USA

State uses legislative powers to set demanding emission reduction target

Battle with Republicans looms as agency edges forward with emissions crack down

Reporting rules could be delayed until 2014 after EPA acknowledges concerns over disclosure of trade secrets

Barack Obama proposes designated solar energy zones, as loan guarantee approved for 845MW Caithness wind farm

Lawrence Berkeley National Laboratory study reveals cost of solar PV installations in US down 30 per cent, but still around a third more than in countries which have pioneered solar panel deployment

New legislation would require silent EVs to produce artificial sound

Government Agencies join forces to promote US clean tech firms overseas

Key tax credits and grants for biofuel producers and renewable energy projects included in controversial tax bill

More proactive government policies could generate an extra £546bn of investment in clean energy, report finds

Court to rule whether polluting power stations constitute a 'public nuisance'