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https://www.earth.com/news/ocean-oxygen-loss-carbon-release-millions-of-years-ago-could-happen-again-today/
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What happened in the ocean millions of years ago could happen again today - Earth.com
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7/1/25 at 11:24pm
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Earth.com
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Ancient limestones reveal how volcanic carbon once suffocated the oceans - offering a stark warning as modern oxygen levels continue to drop.
Science
limestones
Earth
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