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It was just a matter of time before someone figured out how to do it: A solar powered electric bicycle.

Greenalize.com - Leonardo DiCaprio is an Oscar nominee and the star of the biggest box office movie hit Hollywood has ever seen, 1997's "Titanic" with $1.8 billion in global ticket sales.

For a decade he has used his celebrity to raise awareness about environmental issues, and on Friday his new global warming documentary, "The 11th Hour," debuts in major U.S. cities.