Study Shows Continued Spread Of 'Dead Zones'; Lack Of Oxygen Now A Key Stressor On Marine Ecosystems

A new study shows that the number of "dead zones" -- areas of seafloor with too little oxygen for most marine life -- has increased by a third between 1995 and 2007. Dead zones are now "the key stressor on marine ecosystems" and "rank with over-fishing, habitat loss, and harmful algal blooms as global environmental problems."

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