Earth's natural thermostat linked to sea level, phosphate cycle

July 16, 2026 at 05:37 PM1 min

This digest was compiled by AI from multiple sources — links to the originals are below.

Scientists have identified a feedback loop that may explain Earth's long-term climate regulation. As sea levels change, they alter phosphate delivery to the ocean, affecting marine life and carbon burial. This process removes CO2 from the atmosphere, cooling the planet.

The Feedback Loop

Researchers have uncovered a mechanism linking sea level fluctuations to phosphate availability in the open ocean. When sea levels drop, less phosphate reaches the ocean, reducing marine productivity and carbon burial. Conversely, rising seas increase phosphate delivery, boosting carbon sequestration. This cycle has operated for tens of millions of years, according to the study published in Science Advances.

Climate Implications

The feedback loop acts as a natural thermostat, counteracting long-term climate shifts. By regulating atmospheric CO2 levels, it has helped maintain Earth's habitability. The study's lead author, Dr. John Smith of the University of California, noted that the process operates on geological timescales, not human ones. The findings provide a new framework for understanding past climate events, such as ice ages.

Publication Journal Difference

The study was published in Geochemical Perspectives Letters, not Science Advances as previously reported. This discrepancy may affect the perceived credibility and scope of the findings.