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All of that is being dumped into the Gulf of Mexico! The dead zone in the Gulf of Mexico has grown bigger over the years and is a dramatic case of what can happen. Unfortunately, according to many scientists, dead zones are becoming more common in the coastal waters of the United States.
Shrimp trawlers first reported a 'dead zone' in the Gulf of Mexico in 1950, but it was not until 1970 when the size of the hypoxic zone had increased that scientists began to investigate. [28] After 1950, the conversion of forests and wetlands for agricultural and urban developments accelerated .