Earth has a natural thermostat and scientists finally know how it works
Scientists have identified a hidden feedback loop that may explain how Earth has regulated its climate for tens of millions of years. As sea levels rose and fell, they changed how much phosphate reached the open ocean, affecting marine life and the amount of carbon buried beneath the seafloor. That burial removed carbon dioxide from the atmosphere, helping cool the planet.

Earth appears to have a natural climate control system that has helped keep the planet habitable for more than 100 million years. Scientists have long known that this system exists, but the mechanisms behind it have remained difficult to explain.
New research points to a previously overlooked connection between sea level and the availability of phosphate in the ocean. Changes in global temperature affected the size of polar ice sheets, which altered sea level. Those shifts then…




