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Earth's oxygen levels are declining - and scientists aren't sure why

Scientists led by Daniel Stolper at Princeton University studied samples of ancient air trapped in ice in Antarctica and Greenland and made a startling discovery - for the past 800,000 years, the Earth's oxygen levels have steadily decreased. So far no one knows exactly why oxygen levels are declining, but there are a few prominent hypotheses. The ancient ice-trapped air reveals oxygen levels in Earth's atmosphere have gone down by 0.
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