Published: Aug 30, 2011 7:33 PM EDT

LAS VEGAS (AP) - Vice President Joe Biden says the United States can't lead the world in the 21st century with its current energy policy.
    
He says the U.S. will trade its dependence on foreign oil for a dependence on foreign clean energy technology if the nation's leaders don't act.
    
Biden spoke Tuesday at the fourth-annual National Clean Energy Summit in Las Vegas.
    
National politicians and green technology leaders are attending the conference to discuss energy security and independence.
    
Those scheduled to appear include U.S. Secretary of Energy Steven Chu, Nevada Gov. Brian Sandoval and California Gov. Jerry Brown.
    
Chu said in his opening remarks that oil prices will increase while green energy will become cheaper in the future.
    
Senate Majority Leader Harry Reid has hosted the conference since 2008.

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