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The team divided the lake into two halves. Phosphorus is just one of many nutrients that plants need to survive and grow.

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Lakes in these countries are probably becoming more susceptible to eutrophication, which is likely to worsen the quality of life of these countries in the future. The difference between the inputs and the outputs is the amount that accumulates in soils on an annual basis, which we estimated to be between

Short-circuiting the Global Phosphorus Cycle

Although scientists have been studying eutrophication since the turn of the twentieth century, cultural eutrophication was not recognized as a widespread international problem until the s and 60s, when it became a matter of growing concern in both North America's Great Lakes region and in much of Europe. Once in the ocean-probably after taking more detours through plants and animals along the way-it would sink into the sediment.

We wanted to get a large-scale picture because we thought we might have more options for management if eutrophication was recognized as a global, rather than just local, problem. The lake has exhibited many of the symptoms associated with eutrophication since agriculture became the primary land cover in the surrounding watershed, in place of the native prairie and oak savannah. Alternatively, governments could tax fertilizer use to create an incentive for conservation, using the tax revenues to improve water quality.

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  1. Under conditions of low oxygen at the lake bottom, phosphorus lying in the sediment reenters the water column and is once again available to be used by algae.

  2. Because we do not account for the cost of water pollution when we add up the cost of agricultural production, food production seems cheaper than it actually is.