Earth Hour 2011

Earth Hour will be carried out in practical ways, as cities and landmarks apply the core principle of turning off the lights to their everyday routine. In Chicago, the Building Owners and Managers Association (BOMA) developed lighting guidelines to reduce light pollution, and reduce the carbon footprint of downtown buildings. Mount Rushmore in South Dakota will now start powering down each night around 9 p.m. instead of 11 p.m.
In Vietnam, electricity demand fell 500,000 kWh during Earth Hour 2010, which was three times larger than the first time the country joined the event in 2009.
In the Philippines, 1,067 towns and cities pledged participation in 2010 and over 15 million Filipinos participated in the event.
About 4000 cities participated, including landmarks such as Big Ben, the Empire State Building, the Sydney Opera House, the Eiffel Tower, the Parthenon, the Brandenburg Gate, and the Forbidden City.