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After 17 grueling months, Swiss adventurer Louis Palmer's around-the-world trip in a solar-powered car is finally over. Altogether, he traveled 32,000 miles and across 40 countries.

Palmer, who touched down at UN climate change talks in Poznan, Poland, said the feat proved that solar power was a viable alternative to carbon-based fuel sources. Though to do what Palmer did, you'd need to drive a tiny three-wheeler tugging along a solar array almost as big as the car itself.

While the car probably needs a major redesign (and perhaps some more solar panel breakthroughs) to even inch close to becoming a regular on highways, it did disclose some promising technology. The car reached 55mph speeds and could travel for 300km on a single charge. Through the 17 months on almost non-stop driving, it only broke down twice.

Though this car's adventure is over, Palmer's not ready to give up eco-driving yet. He's planning a trip with six vehicles around the world in 80 days (ha!) that would draw power from hydro, geothermal and wind energy. [BBC]

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