Ocean Current Could Rebound From Climate Collapse

A significant weakening or collapse of the Atlantic Meridional Overturning Circulation (AMOC) could lead to severe consequences, such as "ice age" winters in Europe and rising sea levels along North America. Researchers have used a sophisticated climate model to simulate the AMOC's response to rising global temperatures, considering factors like Greenland ice melt and increased air temperatures.

The simulations indicate that even with substantial warming, the AMOC might not permanently shut down. If global temperatures were to reverse and cool, the AMOC could potentially recover its strength within decades. This recovery, however, requires an immense effort in carbon dioxide removal, vastly exceeding current annual rates.

Achieving the necessary rate of global cooling to reverse an AMOC collapse would demand the removal of 45 petagrams of carbon per year, equivalent to 100% of current global emissions. This scale of removal is not feasible with today's technology. More extreme cooling methods, such as solar radiation management, might be considered, but their implications are uncertain.

Furthermore, the study's findings are based on a single climate model and may overestimate the AMOC's stability. While some models suggest reversibility, the process could plunge Europe into further climate chaos. The international project is now running experiments with multiple models to assess the range of potential outcomes.