Earth, captured once a day by the EUMETSAT meteorological satellite, have been time-lapsed. (video looped) Credit: Simon ...

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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 ...

They came up with Earth Day as a way to engage the public and push green issues to the national agenda. Getty Images Even the first Earth Day attracted large crowds, such as these in Philadelphia ...

As the world marks the 50th anniversary of Earth Day, here are five stories about climate pioneers who are digging deep into their history. Across the Sahel in Africa, ancient farming techniques ...