Twenty-two million pounds of plastic waste enter the Great Lakes each year. About half sinks to the lake bottoms, where some of it will likely remain until a future glacier reshapes the lakebeds during the next ice age. The floating plastic won’t last as long, especially varieties that aren’t UV-resistant.
A small portion will be collected by environmentally conscious people and eventually end up in landfills, but most will slowly break down over the next hundred years or so into smaller and smaller fragments known as microplastics.
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