Algae blooms in the Boundary Waters show threat of global warming

By: Patrick Hamilton

Outlets: Minnesota Reformer

Published: April 30, 2026

Words: 751

Last Updated: 3 months ago

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Lienne Sethna and Adam Heathcote, scientists with the Science Museum of Minnesota, were paddling toward a portage in the Boundary Waters Canoe Area Wilderness on a mild, sunny August afternoon in 2024 when their canoe sliced through a glistening green scum floating on the water.

The scientists, who are part of the St. Croix Watershed Research Station, were in the BWCAW to follow up on increasing reports in recent years of people encountering blue-green …

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