According to Earthday.Org, on April 22, 1970, 20 million Americans protested for a healthy, sustainable environment. By the end of that year, the first Earth Day had led to the creation of the U.S. Environmental Protection Agency and the passage of the Clean Air, Clean Water, and Endangered Species Acts. Fifty-one years later, the annual Earth Day celebration continues. Earthday.Org’s theme for this year is Restore Our Earth. It focuses on natural processes and emerging green technologies that can restore the world's ecosystems.