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The Atlantic Meridional Overturning Circulation (AMOC) and Global Warming

The Atlantic Meridional Overturning Circulation (AMOC) is a system of ocean currents that circulates water within the Atlantic Ocean, bringing warm water north and cold water south. It is part of a larger system of global ocean currents known as the "global conveyor belt." The AMOC plays a vital role in regulating the Earth's climate, by transporting heat and nutrients around the globe.

Global warming is causing the AMOC to weaken. This is because as the atmosphere warms, the surface ocean beneath it retains more of its heat. Meanwhile, increases in rainfall and ice melt mean that the ocean water gets fresher too. All these changes make the ocean water lighter and so reduce the sinking in the "conveyor belt," leading to a weaker AMOC.

A weaker AMOC would have a number of negative effects on the Earth's climate. It would cause Europe to cool, as less warm water would be transported northwards. It would also cause sea level rise to accelerate, as the AMOC helps to slow the rate of melting of Greenland's ice sheet. Additionally, a weaker AMOC could lead to more extreme weather events, such as hurricanes and droughts.

The AMOC is a complex system, and it is difficult to predict exactly how it will respond to global warming. However, the evidence suggests that it is weakening, and this could have serious consequences for the Earth's climate.

Specific examples of the effects of a weakened AMOC

  • Europe would cool. The AMOC helps to bring warm water from the tropics to Europe. If the AMOC weakens, this would mean less warm water would reach Europe, and temperatures would cool. This could have a significant impact on European agriculture and other industries.
  • Sea level rise would accelerate. The AMOC helps to slow the rate of melting of Greenland's ice sheet. If the AMOC weakens, this could lead to more rapid melting of Greenland's ice sheet, which would contribute to sea level rise.
  • Extreme weather events would become more common. The AMOC helps to regulate the Earth's climate. If the AMOC weakens, this could lead to more extreme weather events, such as hurricanes and droughts.


The weakening of the AMOC is a serious threat to the Earth's climate. It is important to take action to reduce greenhouse gas emissions and slow the pace of global warming. This will help to protect the AMOC and the many benefits it provides to the planet.


Winter Olympics 2026

| Ireland and Global Warming |
| Visualisation | Global Warming | Links |
En Français --> | Olympiques d'Hiver de 2026 | Visualisation! |
In Italiano --> | Giochi Olimpici d'Inverno 2026 | Visualizzazione! |
Auf Deutsch --> | Winterolympiade 2026 | Veranschaulichung |

Congratulations to Milan–Cortina d'Ampezzo, Italy, chosen for the Winter Olympics in 2026 as announced on 24 June 2019.

See a list of the other applicants that had expressed an interest in holding the 2026 Winter Olympics.