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updated: 4/22/2010 10:13 AM

Through the Years: Images of Earth Day

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Greenpeace activists take water samples to examine pollution levels of Laguna Lake, which is the Phillipines largest freshwater lake. The water test is taken in conjunction with Earth Day.
Greenpeace activists take water samples to examine pollution levels of Laguna Lake, which is the Phillipines largest freshwater lake. The water test is taken in conjunction with Earth Day.
Associated Press file