Riding the bus is a great way to celebrate Earth Day
April 22, 2011 12:54 AM 
HANOVER, GERMANY – SEPTEMBER 24: A visitor steps into a hybrid MAN city bus during a media and industry professionals’ day at the IAA Commercial Vehicles trade fair on September 24, 2008 in Hanover, Germany. The IAA Commercial Vehicles, Germany’s biggest trade fair for trucks and buses, will open to the public on September 25. (Photo by Sean Gallup/Getty Images)
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