Climate change is redistributing water from melting polar and glacial ice toward the equator, slowing Earth’s rotation and lengthening days. New studies indicate these changes are significant enough to affect Earth’s axis and the fluids in its molten core. Published in Nature Geoscience and PNAS, the research suggests human activity has altered Earth’s physical properties, a process that will persist until global temperatures stabilize. Benedikt Soja, a study author, notes that Earth’s altered spin could eventually rival the moon’s tidal forces if carbon emissions remain high.