NPR's John Nielsen reports on a growing environmental problem that's begun to worry scientists and policymakers; nitrification of America's waterways. Different types of nitrogen have been increasing dramatically for decades, from auto exhaust, industrial practices and especially from fertilizers and sewage. The nitrogen causes harmful microorganisms to blossom and kill valuable plants and animals. Curtailing nitrogen may be necessary, but the expense of doing so already has farm and industrial groups worried.



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