They're the Amelia Earharts of clean energy: Starting in March, Swiss pilots Bertrand Piccard and André Borschberg will attempt to become the first people to circumnavigate the world in a solar-powered airplane. Their twelve-leg, 21,748-mile trip will take five months to complete, beginning and ending in Abu Dhabi, with stops in North Africa or southern Europe, and the United States. We had a few questions.