From brushing our teeth first thing in the morning to putting our head on the pillow at night, plastics are part of pretty much everything we do. They not only make life more pleasant, in some cases, they literally keep us alive. But they also have serious downsides. For one thing, they’re made from fossil fuels, which contribute to climate change. And their durability means they pollute land, water, and—in minute quantities—even the insides of our bodies.