The Turanor PlanetSolar, the world's largest solar-powered boat, travels on the Seine river next to the Eiffel tower in Paris September 10, 2013. PlanetSolar, a catamaran powered exclusively by solar ... more 
The Turanor PlanetSolar, the world's largest solar-powered boat, travels on the Seine river next to the Eiffel tower in Paris September 10, 2013. PlanetSolar, a catamaran powered exclusively by solar energy, completed the first solar-powered trip around the world on May 4, 2012 after travelling over 60,000 km (37,282 miles) in 584 days. REUTERS/Charles Platiau (FRANCE - Tags: SOCIETY ENVIRONMENT MARITIME ENERGY SCIENCE TECHNOLOGY) less 
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Reuters | Photo By CHARLES PLATIAU / Reuters
Tue, Sep 10, 2013 8:42 AM EDT