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In recent years, massive fertilizer runoff from big farms has depleted oxygen in parts of the ocean, choking off life in these aptly-named dead zones. That much is well known and widely studied. But in the future, pollution won't be the only thing stripping the oceans of oxygen, as global warming's effects could leave the seas deprived of oxygen for thousands of years, a new computer model simulation suggests. [Source: LiveScience]
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