The weakening of the AMOC is attributed to freshwater inputs from melting glaciers, especially in Greenland, and Earth’s natural climate variability. As global warming continues, Greenland’s glaciers will continue to melt, adding increasing amounts of fresh water to the AMOC. The additional fresh water slows the circulation by reducing the salinity (and thus the density) of surface water, inhibiting its ability to sink, which weakens the mechanism that ultimately drives the current.