Unfinished business: Earth Day 40 years later

This year marks the 40th anniversary of Earth Day, with events around the globe including a rally in Washington, D.C. The first Earth Day was organized by a small group of activists in Dupont Circle.

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VIDEO: Megan Rossman - The Washington Post | SOURCES: Historic video courtesy of Milwaukee Public Television and the Environmental Protection Agency, historic photos courtesy of Environmental Protection Agency, AP and Getty
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