The Western Hemisphere's tallest building can stand a little taller soon, knowing it has one of the smallest carbon footprints of any 1,451-foot giant. Chicago's Sears Tower (bottom) will undergo a five-year, $350 million green upgrade, building officials announced Wednesday, including plans to install wind turbines, solar panels and gardens on its staggered rooftops. The measures are expected to cut the iconic skyscraper's energy use by 80 percent and its water use by 24 million gallons of water a year. (Text from The Daily Briefing)