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In this March 12, 2019 photo, Carl Watras poses in a survival suit jacket near Rock Lake in Vilas County, Wisc. Carl Watras, an limnologist for the University of Wisconsin-Madison's Center for Limnology, and the state Department of Natural Resources has been measuring mercury levels in Little Rock Lake in Vilas County, Wis., for 32 years. Watras found that mercury levels in the lake rise and fall with the water levels, which fluctuate due to climate change. (Sarah Whites-Koditschek/Wisconsin Center for Investigative Journalism via AP)

In this March 12, 2019 photo, Carl Watras poses in a survival suit jacket near Rock Lake in Vilas County, Wisc. Carl Watras, an limnologist for the University of Wisconsin-Madison's Center for Limnology, and the state Department of Natural Resources has been measuring mercury levels in Little Rock Lake in Vilas County, Wis., for 32 years. Watras found that mercury levels in the lake rise and fall with the water levels, which fluctuate due to climate change. (Sarah Whites-Koditschek/Wisconsin Center for Investigative Journalism via AP)

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