Researchers have identified a sophisticated natural mechanism that has acted as a planetary thermostat for tens of millions of years. This discovery sheds light on how Earth maintained a relatively stable climate despite significant geological shifts.
The Role of Phosphate and Marine Life
The study reveals a hidden feedback loop triggered by fluctuations in sea levels. As sea levels rose and fell, the amount of phosphate reaching the open ocean changed significantly. Because phosphate is a critical nutrient for marine life, these variations directly impacted biological productivity in the world's oceans.
Carbon Burial and Atmospheric Cooling
When phosphate levels increased, marine life flourished, leading to a higher rate of organic matter being buried beneath the seafloor. This process effectively trapped carbon, removing CO2 from the atmosphere and cooling the planet. This natural sequestration served as a vital buffer, preventing extreme temperature swings throughout Earth's history.
