<p>FILE - In this April 8, 1970, file photo, Denis Hayes, Head of Environment Teach-In, Inc., the Washington organization coordinating activities for Earth Day on April 22, poses in the group's office in Washington. Teach-ins on the environmental pollution crisis an overpopulation are planned for school campuses across the country that day. (AP Photo/CWH)</p>
April 23, 2010
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April 23, 2010 9 p.m.
Earth Day evolves
WASHINGTON - There was no "Green Movement" yet and little talk of global warming. Instead, the original Earth Day 40 years ago emphasized "ecology" and goals like cleaning up pollution and litter - along with a more anti-establishment vibe than today.