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WASHINGTON -- Earth Day turns 30 on April 22 when thousands of people are expected to converge on the National Mall to hear exhortations from celebrities for a renewed effort to transform America into a clean energy nation. Celebrations are also planned around the country and world, in addition to the Washington event, which is to be chaired and emceed by actor Leonardo DiCaprio, Hollywood's earth ambassador. Organizers say that other notables to join the event include musicians Carole King and David Crosby.