This Sunday more than a billion people will celebrate Earth Day. This year’s theme: ending plastic pollution by Earth Day 2020. Of the nearly 300 million tons of plastic sold each year, about 90 percent ends up in landfills, in the oceans—and in our bodies. Part of the focus will be microplastics, those small bits of plastic that are seemingly everywhere. We speak to Marcus Eriksen of the 5 Gyres Institute, who has led 20 expeditions around the world to research plastic marine pollution, and Priscilla Villa of the #BreakFreeFromPlastics movement.