Earth can regulate its own temperature over millennia, new research finds. Scientists have confirmed that a “stabilizing feedback” on 100,000-year timescales keeps global temperatures in check. From global volcanism to planet-cooling ice ages and dramatic shifts in solar radiation, the Earth’s c
MIT scientists confirm that Earth harbors a “stabilizing feedback” mechanism that acts over hundreds of thousands of years to pull the climate back from the brink, keeping global temperatures within a steady, habitable range.Scientists have confirmed that a “stabilizing feedback” on 100,000-year timescales keeps global temperatures in check.
They found that indeed there appears to be a consistent pattern in which the Earth’s temperature swings are dampened over timescales of hundreds of thousands of years. The duration of this effect is similar to the timescales over which silicate weathering is predicted to act. Scientists have previously seen hints of a climate-stabilizing effect in the Earth’s carbon cycle: Chemical analyses of ancient rocks have shown that the flux of carbon in and out of Earth’s surface environment has remained relatively balanced, even through dramatic swings in global temperature. Furthermore, models of silicate weathering predict that the process should have some stabilizing effect on the global climate.
“We realized this theory makes predictions for what you would expect Earth’s temperature history to look like if there had been feedbacks acting on certain timescales,” Arnscheidt explains.
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