Interactive Timeline

Modern Environmentalism

As Earth Day celebrates its 40th anniversary, we explore the events that have helped shape environmental policy in the U.S.

Note: Please upgrade your Flash plug-in to view our enhanced content.

GRAPHIC: Juliet Eilperin, David Fahrenthold, Alicia Cypress, Sarah Sampsel, Sam Funt - The Washington Post, April 21,2010
A look at Earth Day's influence after it was first organized by a small group of activists in Dupont Circle.

© The Washington Post Company