Earth Day by the numbers

Posted: 0:04 PM EDT Apr 10, 2012   Updated: 3:00 AM EDT Apr 22, 2015

Founded 45 years ago as a day of environmental education, Earth Day is now celebrated worldwide. Check out the numbers behind this global holiday.

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Slideshow Of The Day

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On this Day

  • Washington Monument, Washington DC

    Paul Courson/CNN

    On this day: October 9

    The Washington Monument opens to the public, John Lennon is born, Che Guevara is executed, and President Barack Obama wins the Nobel Peace Prize, all on this day.