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earth day who started it
who was the founder of earth day
who came up with earth day
when was earth day made
who founded earth day
who initiated earth day
who is credited with founding earth day
when was earth day invented
when was earth day created
considered the founder of earth day
what year was earth day created
earth day who started it, who was the founder of earth day, who came up with earth day, when was earth day made, who founded earth day, who initiated earth day, who is credited with founding earth day, when was earth day invented, when was earth day created, considered the founder of earth day, what year was earth day created
