Rules to add costs to fuels that emit the highest levels of carbon dioxide would deny millions of Americans access to stable Canadian energy and add to the nation's security risks, an interest group backed by oil companies said Thursday.

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.

Hoping to speed up the development of renewable energy resources on federal lands, the U.S. Interior Department designated about 670,000 acres of land on Monday as potential areas for solar energy production.

Demand for renewables has created a boom for land previously considered worthless in sunny deserts and wind-swept

U.S. Energy Secretary Steven Chu said on Monday he believes technology can solve environmental problems associated with Canada's oil sands and that the huge nearby resource contributes to U.S. energy security.

U.S. lawmakers introduced legislation this week that would establish a new independent agency to spearhead government clean energy investments.

The bipartisan bill, introduced by Senate Energy and Natural Resources Committee Chairman Jeff Bingaman and ranking member Lisa Murkowski, would establish a Clean Energy Deployment Administration within the Energy Department.

A Florida utility and a real estate developer are aiming to bring the country's first solar-powered city to the Sunshine State.

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