Usher, Gwen Stefani among headliners for Earth Day rally

Usher, Mary J. Blige, Gwen Stefani, Common and Train are scheduled to perform Saturday during the free event hosted by will.i.am 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.