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Harnessing desert energy to power the world.
Can a dirty fuel lead the way to a greener future?
Designers of the Solar Impulse say sun-powered passenger planes are still a ways off, but the technology they're honing could bring dramatic energy savings on the ground.
Vienna builds Europe's largest carbon-zero neighborhood.
Video: Following Zipcar, the green idea of car sharing goes global.
As the official unemployment rate skyrockets, Spaniards go underground to survive.