One-third of U.S. rivers contaminated with ag runoff

China’s environmental degradation has gotten a lot of attention lately—remember the story about 16,000 dead pigs found in the river that supplies Shanghai’s drinking water? But American waterways aren’t faring too well, either. Scott Johnson at Ars Technica summarizes a recent EPA report that shows nearly one-third of U.S. rivers are too high in nitrogen and nearly 40 percent too high in phosphorous. 

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