TIL in the 70’s and 80’s, dead acidic lakes were fairly common in the US, Europe and Canada because of acid rain. The acidity in lakes killed all microbes and aquatic life, resulting in crystal clear water that allowed the lake bottom to be visible.

Read more: https://www.bbc.com/future/article/20190823-can-lessons-from-acid-rain-help-stop-climate-change

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