No. Dead zones, or hypoxia, always occur very near to a coastline in the ocean, or sometimes in a lake. Some are naturally made, but scientists’ growing concern is for the man-made dead zones. The U.N. Environment Program claimed in 2004 that there are about 150 dead zones across the globe. They also report that most of them are near the European coastlines and the East Coast of the United States. Preventative action can be made to reduce the growth of these oxygen-depleted areas, most of which involving reducing nitrogen emissions and discharge.
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