AMOC ocean current weakening threatens global food security

Researchers have warned that the weakening of the Atlantic Meridional Overturning Circulation (AMOC), a vital system of ocean currents, could lead to severe global consequences. A study by the Alliance to Feed the Earth in Disasters (ALLFED) suggests that a collapse of this system could cause global food production to drop sharply. Specifically, wheat, maize, and rice yields could fall by nearly one-fifth in certain countries, potentially driving a short-term global price spike of up to 40 per cent.

Simulations conducted by ALLFED, which modeled a 2°C rise in global temperatures, indicated that by the 50-year mark, global yields for these major crops had already fallen by 5.3 per cent. The collapse could also trigger much colder conditions in northern Europe and disrupt monsoon rainfall patterns across Africa and Asia.

Complementary research from the University of Miami, published in Science Advances, has identified a persistent weakening in the western component of the AMOC. By analyzing data from four monitoring networks across the North Atlantic, researchers observed a decline in current strength between 16.5° N and 42.5° N. While this trend indicates a significant shift in how heat is redistributed across the Atlantic, scientists note that current observations are not yet sufficient to definitively predict the severity of future European winters.