In its latest
report on Great Lakes water quality, the International Joint Commission — a collaboration between the U.S. and Canadian governments — identifies the re-emergence of eutrophication in the lakes as its chief concern.
Eutrophication is unchecked plant growth caused by the presence of excessive nutrients, such as nitrates and phosphorous, in the water. Because that growth can deplete the amount of oxygen in the water, eutrophication poses a major threat to the quality and viability of the Great Lakes' massive water store.
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