Concerns about a key Atlantic current, AMOC (Atlantic Meridional Overturning Circulation), have been raised by scientists. This current plays a crucial role in regulating Earth's climate. If it were to collapse, the consequences could be catastrophic, potentially leading to a 1.5°C [2.7°F] rise in global temperatures. To mitigate this risk, experts recommend better monitoring and research into AMOC's behavior. Governments can also take action by implementing policies that reduce greenhouse gas emissions and transition away from fossil fuels.

Source: https://www.livescience.com/planet-earth/rivers-oceans/we-dont-really-consider-it-low-probability-anymore-collapse-of-key-atlantic-current-could-have-catastrophic-impacts-says-oceanographer-stefan-rahmstorf