by Brian Hamilton
This Thursday marks the fortieth anniversary of the first Earth Day, the largest demonstration in U.S. history. Millions of Americans took part on and around April 22, 1970, with events at nearly every college in the nation, in 10,000 secondary and elementary schools, not to mention community centers, parks, and places of worship. The public outpouring catalyzed Congressional support for a raft of epochal environmental legislation. Perhaps even more important, Earth Day participants—who were more often than not supporters of diverse causes—discovered a kinship with one another, and together began identifying themselves for the first time as “environmentalists.”