Unofficial Earth Day flag, by John McConnell: the Blue Marble (NASA photo) on a blue field
According to the Wikipedia article on Earth Day, over 20 million people participated in the first year, and Earth Day is now observed on April 22 each year by more than 500 million people and several national governments in 175 countries.
Approximately 7,000 people gather on Independence Mall in Philadelphia on the first Earth Day (photo from nationalgeographic.com)
Manhattan filled with pedestrians for a vehicle-less 2 hours on the first Earth Day (photo from NYDailyNews.com)
One of the embroidery patterns from a 1970-71 McCall's Needlework & Crafts magazine
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