From US car sales to Peter Mandelson's optimism – the biggest stories this week
Prototype harvests radiowaves from TV, radio and other mobiles
Some 17,000 US-made fuel-efficient vehicles now in operation in federal fleet
Fallout highlights problems facing negotiators for a post-Kyoto climate deal in Copenhagen this year
Yvo de Boer says industrialised country's targets are not strong enough
Addition will allow drilling up to 45 miles from Florida coast
US state project to be owned and operated by Japanese electronics firms
Official announces threefold rise in targets for installed capacity of both wind and solar by 2020
Public needs to be told the truth on what it will cost to decarbonise UK power supply, says chief executive