There are actually two Earth Days: there's the one we all know and love on April 22 but the same year as the first Earth Day on April 22, 1970, San Francisco mayor John McConnell declared March 21, 1970 as Earth Day too. McConnell chose this date to correspond with the Spring Equinox in the northern hemisphere.
Then Gaylord Nelson, a Wisconsin senator, proposed April 22 as well. With environmental issues becoming increasingly worthy of our attention, we have a promo to span both:
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