Yes, long before Deepwater Horizon, there already was an existing Dead Zone in the Gulf of Mexico. And this 25-year-long environmental disaster was well-known to many scientists. The ignored crisis in the Gulf comes from the constantly increasing level of chemical nutrients, mostly nitrogen and phosphorus, that's fed into the Gulf from the Mississippi River. It has caused continuing damage to some of America's best fishing waters. The only difference between this long-term chemical Gulf disaster and the more recent oil-based problem is that virtually no one in America knew or even cared about it.
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