Clear Lake in California is contaminated by both mercury and algae, which can have negative effects on human health and the environment:
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The Sulphur Bank Mercury Mine, located on the eastern shore of Clear Lake, has been contaminating the lake with mercury since the 1870s. The mine closed in 1957, but mercury-contaminated waste continued to erode into the lake for decades. Clear Lake is one of the most mercury-contaminated lakes in the world. Mercury is dangerous because it can accumulate in animal tissues and the food chain
