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By the time April 22 came around, 5,000 environmental groups around the world were on board reaching out to hundreds of millions of people in a record 184 countries.

This was the beginning of Earth Day.

This was the first of several events held at university campuses across the United States in the lead-up to the first Earth Day.

More students were likely to be in class, and there would be less competition with other mid-week events.