WWF’s Earth Hour is right around the corner and receiving support all over the world. On March 27 at 8:30 p.m. local time, people across the globe are asked to turn out their lights for one hour in an effort to recognize the need for energy conservation as a way to combat climate change and benefit the environment.

U.S. landmarks such as Seattle’s Space Needle, Washington D.C.’s National Cathedral, St Louis’ Gateway Arch, and the Las Vegas strip have all signed on to participate in this year’s hour of darkness. Outside the U.S. thousands of cities in more than 105 countries will participate in Earth Hour 2010 including Athens, Dubai, Hong Kong, Moscow, Sydney, Tel Aviv, and Toronto.

Last year’s Earth Hour attracted an estimated 80 million participants in the U.S. and nearly a billion people around the world. In celebration of the global phenomenon that dimmed lights from New York to China we want to take a moment and reflect on the images from Earth Hour 2009.

Click here to view our gallery of stunning 2009 Earth Hour Photos.