Why do we celebrate Earth Day?

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Earth Day is an annual global event, observed on April 22, that celebrates the environmental movement and raises awareness about pollution and ways to maintain a clean habitat.

This year marks the holiday's 51st anniversary. And while many will be celebrating the occasion, few people know about the history of the event and why we celebrate.

The event was first celebrated nationally in 1970, but its inception began following a massive oil spill in Santa Barbara, CA in 1969.