Really the main threat is human beings itself………….
Eighty percent of pollution to the marine environment comes from the land. One of the biggest sources is called nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, ranches, and forest areas. Millions of motor vehicle engines drop small amounts of oil each day onto roads and parking lots. Much of this, too, makes its way to the sea.
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In a word: humans. Most of the pollution in the ocean is caused by wasteful acts and manufacturing processes of of human beings. Most of the pollutants are a direct or indirect result of human behavior. 80% of marine pollution comes from the land, with a large source of it from nonpoint source pollution. Many manmade things and many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, ranches, and forest areas all contribute heavily to ocean pollution.
Fertilizer runoff from farms is majorly detrimental to the health of the world’s oceans. The excessive fertilizer can lead large amounts of algae to grow, which uses all of the oxygen so that other marine life dies off. These are called dead zones, and there is a major one in the Gulf of Mexico.
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