Lake McDonald in Glacier National Park is one of the most pristine lakes in the world. If one is in a boat and looks down into its waters, you can see the bottom, even 40-50 feet down.
But a study this summer found potential trouble in the lake — microplastics. Microplastics are tiny bits of plastic that are less than 5 mm in size, or 0.2 inch.
https://hungryhorsenews.com/news/2021/oct/27/microplastics-found-glacier-national-parks-lake-mc/
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