Scientists have found new evidence that the Earth's natural feedback mechanism regulated carbon dioxide levels for hundreds of thousands of years.But they say humans are now emitting CO2 so fast that the planet's natural balancing mechanism cannot keep up.
The researchers, writing in the journal Nature Geoscience, say their findings confirm a long-believed theory.
Carbon spewed out by volcanoes is removed from the air by rock weathering and transported to the ocean floor.
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