Usher, Gwen Stefani among headliners for Earth Day rally

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Usher, Mary J. Blige, Gwen Stefani, Common and Train are scheduled to perform Saturday during the free event hosted by and Soledad O'Brien. The rally runs from 11 a.m. to 7 p.m. near the Washington Monument.

Earth Day Network President Kathleen Rogers says the game and celebrity power will help more people focus on solving climate change.