In just the past two decades, industrialization, population growth and intense use of chemical fertilizers have doubled the amount of nitrogen in circulation among living things...And this sudden explosion of nitrogen has meant mounting worldwide environmental problems that promise to soon get worse and, some scientists predict, to reach the point of calamity." Some examples: More frequent algae blooms (red tides) kill fish and other sea life in coastal waters, invasive plants take over prairies in Minnesota, acid rain in the Blue Ride Mountains, visibility impaired in waters near the Great Barrier Reef, forest mushrooms disappear in Holland.
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