March 27, 2010 at 8:30pm local time is Earth Hour. Across the world, as the Earth Hour approaches, people, cities, and famous landmarks are joining in by turning off the lights. Many parts of the world have already passed through Earth Hour, as shown in the photos above.

Celebrate by turning out the lights and posting photos of your Earth Hour in the Earth Hour 2010 group.

Photos by aeson_b, olvwu | 莫方, toni•pino, Myfanwy Young, oeyvind, Gooji, bokhbokh bokhboucci and macdomeng.