The idea for a national day focused on the environment came to Gaylord Nelson, a U.S. Senator from Wisconsin, after witnessing the ravages of the 1969 massive oil spill in Santa Barbara. He wanted to infuse the same energy the anti-war movement had into raised awareness of air and water pollution. https://www.earthday.org/about/the-history-of-earth-day/?gclid=EAIaIQobChMI9v6pjszc4QIVk6DsCh2HvwsLEAAYASAAEgLlivD_BwE