Re: 5cm could be an over-estimate
As sea levels rise, the reefs will rise with them and so will the land level. As sea levels fall, the reefs will sink with it and exposed "Land" will be rapidly eroded away.
Great post, and a concept even I'd not considered. Thanks very much for teaching me something worthwhile before my day is even really started!
How well coral growth can keep up with rapid changes in sea level and changing sea temperatures I do not know.
I honestly don't believe it's temperature we have to worry about.
The plastics and other pollutants we dump into our oceans however - that's a whole different matter.