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08/29/2007: "Humans de-oxygenate oceans, slowing fish reproduction"

Low oxygen levels in coastal waters interfere with fish reproduction by disrupting the fishes' hormones, a marine scientist has found. Incidents of seasonal low levels of oxygen, known as hypoxia, have increased dramatically in coastal waters throughout the world over the past few decades, largely as a result of increased run-off from human agricultural and industrial activities. Hypoxia's long-term impact on marine animal populations is unknown.

[ More damage for mass popularity. If we limited our population, this wouldn't be a problem. But that's unpopular. ]

http://www.sciencedaily.com/releases/2007/08/070829090213.htm