Nobel laureate and former US vice president Al Gore on Thursday urged Americans to shoot for the moon and make a total shift from fossil fuels to renewable energy to avert a global crisis sparked by climate change.

"I challenge our nation to commit to producing 100 percent of our electricity from renewable energy and truly clean carbon-free sources within 10 years," Gore told thousands of people who packed into a conference hall near the White House to hear the 2007 Nobel Peace Prize winner speak.

The shift to new energy sources was needed to ensure "the survival of the United States of America as we know it," Gore said.

"Even more, the future of human civilization is at risk," he told the crowd, who punctuated his speech with cheers and applause.

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This video is from, broadcast July 17, 2008.

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