Here are some facts you might not know about Earth Day...
1. The first Earth Day was on April 22, 1970. Earth Day originated in the U.S. but became recognized worldwide by 1990.
2. Earth day got its start after Sen. Gaylord Nelson visited a site of an oil spill near Santa Barbara in 1969. He wanted to find a way to mobilize a grassroots movement to raise awareness of environmental issues.
3. Today Earth Day is usually associated with small-scale tree plantings and volunteer cleanup projects, but the first Earth Day had its sights on bigger political change.
4. Earth Day demonstrations contributed to creating public support and lead to the formation of the Environmental Protection Act (EPA) as well as the Clean Air, Clean Water, and Endangered species acts.
5. This year more than 1 billion people are expected to participate in Earth Day events in 192 countries.