Rae-Ann Eifert, a lake monitor for the Wisconsin Department of Natural Resources, braved sub-freezing temperatures to gather buckets of water for testing off a Lake Michigan breakwater in Racine, Wis., on Feb. 28, 2024, as part of an effort across the Great Lakes to understand the effects of an iceless winter. Unseasonable warmth has left the Great Lakes all but devoid of ice, leaving scientists scrambling to understand the consequences as climate change accelerates. (AP Photo/Teresa Crawford)
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