Earth Day by the numbers

Posted: 12:04 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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On this Day

  • 1984 Summer Olympics opening ceremony

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    On this day: July 28

    Vivaldi and Bach die, the first hamburger is sold in the U.S., World War I breaks out, a bomber crashes into the Empire State Building, and the Summer Olympics open up in Los Angeles, all on this day.