Melting ice is slowing Earth's spin, shifting its axis and influencing its core

Recent research indicates that climate change is significantly altering Earth's physical properties, including its rotation and axis. As polar and glacial ice melts due to global warming, water is redistributed toward the equator, increasing mass around the planet's middle. This redistribution slows Earth's rotation, potentially lengthening days. Two studies published in Nature Geoscience and the Proceedings of the National Academy of Sciences highlight that these changes are profound enough to affect the Earth's axis and even influence the dynamics of its molten core. The research suggests that human activities have fundamentally altered the planet's characteristics, a trend expected to continue until global temperatures stabilize.

The studies indicate that the impact of melting ice could rival the tidal forces exerted by the moon if carbon emissions remain high. Traditionally, factors like the moon's gravitational pull and the rebound of the Earth's crust after the Ice Age have influenced Earth's spin. However, the rapid melting of ice is emerging as a significant new force. Additionally, the movement of fluids within the Earth's core is also affected by these changes, creating a feedback loop between surface processes and the core. This research has implications for timekeeping and satellite navigation, as even minor shifts in Earth's axis can lead to significant errors in space missions. Overall, the findings underscore the interconnectedness of climate change and Earth's physical dynamics.