Earth Day to be marked in Washington D.C.
15:26, April 20, 2010

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A man listens to music inside a solar-powered environmental structure at the National Mall in Washington D.C., the United States, April 19, 2010. A massive Climate Rally will be held in the US capital on Sunday to commemorate the 40th anniversary of Earth Day. (Xinhua/Zhang Jun)
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(Editor:梁军)
