Image: Ed-Muskie-at-Earth-Day-1970-web

Description: US Senator Edmund Muskie, author of the 1970 Clean Air Act, addressing an estimated 40,000-60,000 people as keynote speaker for Earth Day in Fairmount Park, Philadelphia on April 22, 1970.
Title: Ed-Muskie-at-Earth-Day-1970-web
Credit: http://earthweek.us/wp-content/uploads/2010/04/Ed-Muskie-at-Earth-Day-1970-web.jpg
Author: Peter54321
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