Earth Day started in 1970 when people — including Wisconsin Sen. Gaylord Nelson — brought attention to the impact oil spills, pollution and smog were having on the planet. "Then in January ...

Learn about Earth Day founder Gaylord Nelson (1916–2005) and how environmental disasters of his day inspired the creation of Earth Day in 1970. On December 7, 1972, Apollo 17 astronauts captured a now ...