Earth Day began as a protest in 1970, but its meaning has evolved. Here’s how it changed - and what it represents today.
Earth Day is April 22. Here's what to know about how Earth Day happened and how to celebrate our planet this April.
See stunning photos of Earth taken from space by astronauts and robotic spacecraft, celebrating our home planet on Earth Day.
Fifty-six years after the first one rallied 20 million people across America, “we need to do things that make us feel more ...
How did looking back at the Earth for the first time change humanity’s perspective? The legendary thinker Stewart Brand tells ...
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