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As another massive "dead zone" forms in the Gulf of Mexico, other patches of low-oxygen waters are expanding elsewhere in the ocean, threatening marine ecosystems as climate change accelerates. Oxygen-deficient zones naturally occur in belts along the equatorial waters of eastern ocean basins. But as more and more carbon dioxide is pumped into the atmosphere from the burning of fossil fuels and as ocean surface temperatures continue to rise, deoxygenation zones are expected to expand - with profound implications for marine life. [Source: United Press International]
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