David Cameron

Up to 50 vehicles will be involved in experiment backed by David Cameron and Boris Johnson

Brazil reported to have moved dates for historic summit to make it easier for Commonwealth leaders to attend

Good Energy writes open letter to prime minister, backed by 18 social landlords responsible for 316,000 UK homes

Labour MP Alan Whitehead warns planned cuts to feed-in tariffs will have "devastating effect" on community schemes

Solar power sector to deliver a petition urging prime minister to rethink imminent feed-in tariff cuts

As Environmental Audit Committee urges Prime Minister to travel to Rio Summit, sources confirm he will instead attend Diamond Jubilee celebrations

Prime minister and energy secretary call a summit with six biggest suppliers in effort to reduce household bills

Tobias Parker of Sustain argues the Chancellor should quit attacking green firms and get on with reforming the tax system

Cameron and Osborne sound death knell for 'greenest government ever' pledge, with complete sidelining of low-carbon economy