The Obama administration wants to reduce oil consumption, increase renewable energy supplies and cut carbon dioxide emissions in the most ambitious transformation of energy policy in a generation.

Two of the biggest oil companies in the world, BP and ConocoPhillips, have joined forces to try to break a longstanding deadlock over the vast reserves of natural gas in Alaska. The firms said they would spend billions to build a pipeline from the North Slope to feed markets in the United States and Canada. The proposal Tuesday won praise from Alaska's governor, Sarah Palin. "It's a good day," she said to reporters.

In the tense debate between energy security and environmental sustainability, Canada