This is the study which is behind the recent news articles on the AMOC collapse:

https://www.science.org/doi/10.1126/sciadv.adx4298

Basically newer modeling has shown a stronger weakening of the system. Lots of uncertainty, but 1/3rd loss by 2100. There's a lot of unknowns with feedback loops and tipping points where the whole thing might collapse if a threshold is crossed.