Last year, more than 2.2 million Earth Hour participants shut off their lights throughout Sydney in a powerful stand in support of protecting the environment. Tonight, the lights off action is going global! Around the world, cities on every continent – including Atlanta, Bangkok, Bogota, Chicago, Dublin, Montreal, Manilla, San Francisco, Sydney, Tel Aviv and more – 20,000+ businesses and almost 300,000 individuals have signed up to turn off the lights and turn up environmental awareness.

Tonight’s Earth Hour is an initiative of the World Wildlife Fund International drawing people together with one simple action: at 8:00p.m., wherever you are, turn off the lights for one hour.

Here’s some food for thought, if the greenhouse reduction achieved last year in the Sydney Earth Hour was sustained for a year, it would be equivalent to taking 48,616 cars off the road for a year. Imagine what flicking a switch can achieve tonight with millions of people participating around the globe!

Local events will coincide with 8-9p.m lights out to highlight energy conservation. Online, Google will be turning the lights off on the homepage in recognition of Earth Hour. You can watch Earth Hour events unfold around the globe at the Earth Hour Blog and see the Earth Hour in pictures at flickr.

Join the global effort to make a positive impact on climate change tonight!

Visit + Earth Hour for more!