As of 2008 there were 405 dead zones across the earth’s oceans. Some of these are caused by algae blooms but many are cause my human pollution like the dead zone around New Orleans from all the industrial and agriculture toxins dumped/flowed into the water. The Chesapeake Bay also has dead zones because of all the traffic through the bay, and there is one off the Oregon coast that only appears in the summer.
The Amazon in South America and the Yellow River in China have also been recognized for creating dead zones due to farming runoff.
Data has shown that these runoffs may have been around for awhile, and we’re only recently discovering them.
Check out this news article about it:
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