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 hide caption

itoggle caption Mark Dadswell/Getty Images

Palestinians walking in front of a mural of late Palestinian leader Yasser Arafat in Gaza City earlier today. Mohammed Abed /AFP/Getty Images hide caption

itoggle caption Mohammed Abed /AFP/Getty Images