CBC News - Technology & Science - Extinctions feared as ocean dead zones grow
Scientists fear the planet is on the brink of another mass extinction as ocean dead zones continue to grow in size and number.
More than 400 ocean dead zones — areas so low in oxygen that sea life cannot survive — have been reported by oceanographers around the world between 2000 and 2008.
That is compared with 300 in the 1990s and 120 in the 1980s.
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