15th December 2025
What is AMOC?
AMOC, the Atlantic Meridional Overturning Circulation, is a system of ocean currents that help distribute warm water around the world. (1)
I wrote about this last month – https://greentau.org/2025/11/18/counting-on-189/ – but want to recommend Professor Tim Lenton’s address at the National Emergency Briefing which illustrates vividly the impact if AMOC fails: https://youtu.be/tmd6MDiJmQU?si=RcnuJIDqMeJHirD5
Research, which is still on going, suggests that the topping point which will make the collapse of AMOC inevitable could be passed in the next few decades – but the resulting collapse of the system might take another 50-100 years to happen. Even keeping the global temperature rise to the 1.5C Paris target is now predicted to carry a 10-25% risk of reaching this tipping point before the end of the century. It is a risk we cannot afford to take given the impact it will have on the viability of human life – even if that will not effect us now, it will effect future generations, our children and our children’s children. (2)
The Green Tau 