Only four prospective Conservative MPs sign up to campaign group's climate change pledge list

New strategy aims to cut emissions from vans and light trucks

Latest round of signatories to the Covenant of the Mayors takes number of cities committed to producing climate change action plans to more than 1,600

Tony Hayward meets US politicians and regulators as criticism of oil giant's reaction to well blow-out mounts

Search giant makes first direct investment in large-scale renewable project, ploughing $38.8m into two North Dakota wind farms

With Australia's official Department of Climate Change web site still saying the delayed cap-and-trade scheme will go ahead, businesses have warned uncertainty over the price of carbon will hit investor confidence

Ambitious plug-in hybrid start-up on track to deliver first cars by the end of the year

Prosecutors confirm that four arrests have been made in €180m fraud investigation

"It would be the worst thing in the world to take the one Republican working with you and make him own the one thing you don't like"

From German fraudsters to Nick Clegg's loathing of all things nuclear, we run down the top green business stories from the last week