Barack Obama

Senior figures warn that the president may need at least another six months to win domestic support for any proposal

President says $129bn that has been allocated for environmental plans is off limits to Congress

Southern California Edison's facility one of two approved by the US energy department to investigate electric car performance

AT&T inks alliance with SmartSynch designed to make it easier for utilities to access smart meter data

President signals he is willing to compromise on cap-and-trade legislation and allow some free allocation of carbon permits

Having signalled his support for biofuels, Obama now faces calls to increase amount of ethanol that can be blended with conventional fuels

Climate minister says Obama's commitment to environment has raised prospects of global agreement at UN summit in December

President backs up environmental rhetoric with the greenest budget in US history

Consultancy claims quick dispersal of government funds could encourage investors back towards clean tech firms

"We invented solar technology, but we've fallen behind countries like Germany and Japan in producing it," warns president