| Mercury Levels on the Rise in Lake Erie After Decades of Decline | |
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Tree Hugger
Jul 15 2010
Until 1970, mercury was not classified as a dangerous compound in the United States. Before the metal was regulated, it was used extensively in industry—especially in paper making and chemical refining processes. Much of this industry lined the banks of the Great Lakes and, before 1970, factories dumped the contaminant into the water. |
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