06/22/2010 05:12 am ET Updated May 25, 2011

Earth Day: What Began As Anti-Business Is Now Big Business

So strong was the antibusiness sentiment for the first Earth Day in 1970 that organizers took no money from corporations and held teach-ins "to challenge corporate and government leaders."

Forty years later, the day has turned into a premier marketing platform for selling a variety of goods and services, like office products, Greek yogurt and eco-dentistry.

Read more on The New York Times