A few tinkerers are coming up with solar-powered scooters and pedal vehicles , like the Elf trike being sold in North Carolina . Solar Impulse is the first manned plane to fly 24 hours on sun power . Score: 7 Adventurer Bertrand Piccard wants to pilot a solar plane around the globe . Solar Impulse promotes renewable energy sources and energy-efficient technology .
Solar Impulse is the first manned plane to fly 24 hours on sun power . Score: 7 Adventurer Bertrand Piccard wants to pilot a solar plane around the globe . Solar Impulse promotes renewable energy sources and energy-efficient technology .