Earth Day is an annual event, celebrated on April 22, on which events are held worldwide to demonstrate support for environmental protection. It was first celebrated in 1970, and is now coordinated globally by the Earth Day Network, and celebrated in more than 192 countries each year.
-- On This Earth Day, It's Actually Easier To Be Green - Forbes
-- Celebrate Earth Day With Today’s Animated Google Doodle
-- National Geographic: The Story of Earth HD
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