Wind generators at Pacific Hydro's Cape Bridgewater wind farm in Warrnambool, Australia, in May 2012. Each generator produces roughly enough energy to meet the annual needs of 12,000 households.
Mark Dadswell/Getty Images
Residents of Mutriku, a fishing village on Spain's northern coast, lounge at their local beach, protected from fierce Atlantic waves by a cement breakwater that also houses Europe's first wave energy plant.
Lauren Frayer for NPR