Grimy green, or clear and clean?

Bluegreen algae in lakes are fed by phosphorus and can sometimes grow out of control when the weather gets hot. Lakes with elevated levels of chloride (salt) are also more likely to experience algae blooms.

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Subtle signs of a changing climate

Bluegreen algae blooms have become more prevalent in urban lakes, as well as in pristine northern lakes including Lake Itasca, the Boundary Waters, and Quetico Wilderness Area.

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