The first Earth Day is celebrated.

Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally through earthday.org including 1 billion people in more than 193 countries.

April 22 is the 112th day of the year in the Gregorian calendar; 253 days remain until the end of the year.