Just for a change....

[AntarcticPilot]

Something to do with the ice being fresh water and the sea being salty. Must fit the plimsoll line? Or freezing water expanding so it floats?

I think it was also to do with temperatures. But it's a slight effect; it's more relevant to Antarctic ice-shelves, which are floating extensions of continental ice, hundreds or thousands of metres thick.

 

[Daydream believer]

What possess the Scot’s to developed the kilt with nastymidges and thistles?

It is so they can give their bum a good scratch when they get a bite

 

[franksingleton]

Even if all the (floating) ice at the North Pole melted, how is that going to cause flooding?

Archimedes had the answer to this one - except, as Antarctic Pilot said, for a change in albedo. Far more significant, and what we have been seeing is the melting of water locked up in land ice. Potentially, that would result in a 7m rise in global sea levels.
The AMOC effect is clearly a potential major issue. At this stage, nobody really knows. Modelling the effect of global warming on the climate is a difficult computational issue.
For a description of the AMOC and the uncertainties regarding its future, see The Atlantic Meridional Overturning Circulation in a changing climate. This isworth reading if only for its balanced approach with no hyperboles.
In short, we know that climate is changing. We know why. Some of the consequences are obvious as we well know. There are unknowns, not always known.