Earth Hour 2009

Earth Hour 2010 was held from 8:30 p.m. to 9:30 p.m. local time, March 27. In Israel, the hour was held on April 22.
Earth Hour 2010 was reportedly the biggest Earth Hour yet, aiming to garner more than the one billion participant goal of 2009's Earth Hour.
126 countries participated in Earth Hour 2010.
In the United States polling shows that an estimated 90,000,000 Americans participated in Earth Hour as lights were turned off around the country, including iconic landmarks such as Mount Rushmore, the Las Vegas Strip, the Empire State Building and Niagara Falls.