April 5, 2012 at 08:42pm
Last weekend, lights all across the globe turned off to build awareness about energy use. European Space Agency astronaut André Kuipers watched and blogged from the International Space Station as each time zone hit 8:30 p.m. -- and tracked to see who on Earth turned out the lights. Earth Hour 2012 involved individuals, companies and landmarks to switch off lights in 147 countries and territories and over 5,000 cities. The Sydney Opera House, Empire State Building and Eiffel Tower went dark. Check out https://twitter.com/#!/search?q=%23EarthHour and http://www.earthhour.org/.