[vidarh]

Not that simple. It's not just about managing a few meters, but managing a few meters increase in worst case. E.g for London a few meters is a minor problem in normal situations, but a few meters in worst case situations have potentially dramatic impact on costs to upgrade the Thames Barrier, and will have dramatic impact in terms of how large areas downstream of London will get flooded if the Thames Barrier needs to be closed.

A lot of cities face issues with follow on effects like that.

It won't be 'the end of the world' if its just a few meters, but it is still enough that cities like London face multi billion flood defence upgrades, and towns housing hundreds of thousands will face increased flood risks as a consequence of anything done to upgrade the defences.

And you're severely underestimating the direct damage. Many of the highest population density areas in the world are at risk,and many of the areas at worst risk are also among the poorest, like Bangladesh.

As for extreme weather, yes indications are that we're heading for more overall extreme weather, not just changes.