The Environmental Protection Agency on Thursday said it was extending the comment period on a draft rule that aims to cut greenhouse gases emitted by biofuels.

The proposed changes to the 2007 U.S. Renewable Fuel Standard attempt to make production of corn-based ethanol more efficient and increase output of advanced biofuels.

The dramatic growth in wind turbines around the British Isles may lead to huge spikes in power prices by 2030 and threaten the viability of backup plants needed for calm periods, according to Poyry Energy Consulting.

Norway's government proposed a new law on Friday to develop sea-based wind power as part of a plan to diversify from offshore oil and gas toward renewable energy.

"Offshore wind energy may become the next adventure for the Norwegian industry and energy sector," Oil and Energy Minister Terje Riis-Johansen said in a statement of a draft bill presented by the center-left government.

An environmental group on Wednesday asked U.S. Secretary of State Hillary Clinton to deny permits for pipelines that would bring oil from Canada's oil sands to the United States.

A global shift toward nuclear power is prompting countries to rush to lock in long-term access to tight supplies of uranium, and China and India look to be the next players to get in on the action.

Chu launched the "Low Carbon Communities of the Americas" program at an event on energy and climate change that was put together after presidents at the Fifth Summit of the Americas in April agreed to collaborate more on green energy issues.

U.S. lawmakers on Thursday sought to increase incentives for nuclear power and energy efficiency in a measure that would require utilities to generate a certain amount of electricity from renewable sources.

Using a mobile phone-based software program has enabled a test group of Volvo employees to cut the greenhouse gas emissions of their daily commute by more than 30 percent.