Earth Day by the numbers

Published: Apr 10 2012 12:04:15 PM EDT   Updated On: Apr 22 2014 02:00:00 AM EDT

Founded in 1970 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

  • Lou Gehrig, New York Yankees file photo

    Library of Congress

    On this day: August 20

    Charles Darwin publishes his theory of evolution, the NFL is founded, Lou Gehrig belts his 23rd career grand slam and NASA heads for Mars, all on this day.