Nutrient Pollution
Choking the Seas
Not all ocean pollution arrives there directly; rivers and streams act as arteries to carry manmade toxins into the seas. It’s called nutrient pollution, which might seem to be something of an oxymoron. After all, nutrients such as nitrates and phosphates are essential to all living organisms and play a vital role in the functioning of life on Earth. But, says Boyce Thorne-Miller, senior scientist with SeaWeb, “We’re introducing massive amounts of nutrients-way above normal levels-into coastal waters, through things like fertilizer and sewage from agriculture, and the burning of fossil fuels by factories and cars. And these are having devastating effects.” Indeed, the Environmental Protection Agency (EPA) has listed “nutrients” as the major cause of impaired estuaries in this country, while a panel of scientists in 1997 described nitrogen pollution as arguably “the most serious human threat to the integrity of coastal marine ecosystems.”