In Miami, Florida, they held a "Dead Orange Parade" where the winning float sported a statue of the Statue of Liberty wearing a gas mask.
In Omaha, Nebraska, they collected 156,000 cans and built a tin mountain.
In Albuquerque, New Mexico they played mariachi music and marched to protest the stench of a sewage treatment plant.
Over 20,000,000 people took part in the first Earth Day, on April 22, 1970, a tenth of the population of the United States. It was the largest demonstration in U.S. history.
“Earth Day 1970,” CBS News with Walter Cronkite,