Wonder how Earth Hour was usher on the 28th Mar 2009.Here are some amazing and interesting photos during the event.

4. People watch a free open air concert in Melbourne, Australia, Saturday, March 28, 2009, during Earth Hour 2009. Organizers boasted the concert was people powered. An activity named Future Spark saw 20 push bikes fitted with custom made electric generators being ridden from the 23rd to 28th of march and generating enough power to run the free open air concert.

5. People ride push bikes fitted with custom made electric generators in Melbourne, Australia.

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