October 21, 2006
Number of Ocean’s “Dead Zones” on the Rise
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According to UN experts, the number of "dead zones" in the world's seas and oceans has risen more than a third in the past two years because of fertilizer, sewage, animal waste, and fossil fuel burning. The damage is caused by explosive blooms of phytoplankton, which die and sink to the bottom, and are then eaten by bacteria that use up the oxygen in the water. Those blooms are triggered by too many nutrients — particularly phosphorous and nitrogen.
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