While Earth Day began in the U.S. on April 22, 1970, it did not go international until 1990. It started out with 200 million people in 141 countries and eventually grew to the mammoth proportions mentioned above. - Study24x7
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23 Apr 2019 12:22 PM study24x7 study24x7

While Earth Day began in the U.S. on April 22, 1970, it did not go international until 1990. It started out with 200 million people in 141 countries and eventually grew to the mammoth proportions mentioned above.

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