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By Erik Hoffner
Denis Hayes was the principal national organizer of the first Earth Day in 1970, and he took the event to the international stage in 1990. He is board chair of the international Earth Day Network, and president of the Bullitt Foundation.
Earth Day 2018 is slated for April 22 and focuses on plastic pollution, so Mongabay took the opportunity to ask him about this year's event and find out what else is on the mind of this key leader of the international environmental movement.