Earth Hour is almost upon us -- 8:30 p.m. local time on Saturday, March 28.
Don't know what Earth Hour is? Organized by the World Wildlife Fund, it is a worldwide effort to raise awareness about climate change with the hopes of spurring political action. Individuals, businesses and governments are encouraged to turn off their lights for an hour. It is estimated that 36 million people in the U.S. participated in Earth Hour in 2008.