After an oil spill off the coast of Santa Barbara, Calif., in 1969 — the largest oil spill in U.S. history at the time — Sen. Gaylord Nelson of Wisconsin and Rep. Pete McCloskey of California formed a nonprofit group called Environmental Action.
The first goal of the group was to hold a national teach-in day about the environment. A nine-person staff was assembled in Washington, D.C., to get the word out about the day, which was scheduled for April 22, 1970, and dubbed "Earth Day."
Bryce Hamilton, an Iowa native who now lives in Minneapolis, was chosen for that elite staff. Then 28, Hamilton was named coordinator of high school activities.
Hamilton's job was to connect with school-age students around the country by answering phone and mail requests from students and sending them information packets to help them plan Earth Day observations.
"Americans are becoming angry, angry that their rivers are being used as sewers, that their beaches are black and oily, and that their wetlands and natural areas are being swallowed up by voracious land developers," Hamilton wrote in an emotional letter to students to get them thinking.
"… As a concerned student, you have a unique opportunity to promote environmental awareness where it is much needed — in your school, home and community."
He included a long list of actions students might take, including learning about pending anti-pollution bills, making posters and banners, starting a newsletter and taking field trips led by conservationists and biologists.
Long before the advent of social media, Hamilton said the idea caught on quickly.