Scientists uncover the 2.3-billion-year-old secret that helped keep Earth habitable
Scientists have identified an ancient feedback loop involving phosphorus and ocean chemistry that helped sustain Earth's oxygen levels 2.3 billion years ago. This mechanism allowed for the continued accumulation of oxygen, which was essential for the development of complex life.
Why it matters
Understanding how Earth maintained its habitability provides critical context for the history of life and the conditions necessary for complex organisms to thrive.
More than 2 billion years ago, Earth underwent a dramatic transformation as oxygen began building up in its atmosphere. But that change left scientists with a major mystery: How did the planet maintain enough oxygen to remain habitable over millions of years?
Researchers have now uncovered evidence that the answer may lie in an ancient recycling system within Earth's oceans. By studying rocks from South Africa, they found that changes in ocean chemistry helped create a natural cycle in which biological activity supported the continued accumulation of atmospheric oxygen.
The research, published in Nature Communications , involved scientists including University of California, Riverside geologist Andrey Bekker. Their findings suggest that phosphorus, a nutrient essential for life, played a central role in sustaining the oxygen levels that would eventually help make more complex organisms possible.
How Ancient Oceans Helped Sustain Earth's Oxygen
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