The Doomsday Glacier in Antarctica is already affecting Maui especially where the hotels are in Kaanapali, Maui north of Lahaina

 Here's the problem:

The sea storms in the winter are destroying slowly the beach at Kaanapali. But, if you build a sea wall in the water you will destroy the coral beds and sea life.

I was thinking about this and mostly you are dealing with waves in the winter that you don't want to entirely inundate the first and 2nd floors of fancy hotels on the beach in Kaanapali. But, if the doomsday glacier melts in the next 20 years time it's likely that the first floor at least of these hotels will be underwater and people would have to get into those hotels by boat or a dock or something like this and get into the places on the 2nd and 3rd floor before taking their elevators up to their rooms. 

They likely will have to "Write off" the bottom floors entirely here in Kaanapali where we are staying right now if this happens.

But, it's the winter storms that go far above whatever the sea level is then that are the biggest concern to locals both wealthy and middle Class and poor.

So, there are many disagreements politically about all of this as you could expect. There is the ecology point of view which is "Save the Coral Forests by not putting a sea wall in out beyond the beaches.

And then there are the owners of these hotels that don't want the bottom floors in their hotels underwater soon (or within 20 or 30 years).

NOTE LATER:

One temporary solution would be to build a sea wall on shore that went up about 10 feet that was built beyond where high tide is now. This way you don't affect the coral beds (at least for now) for the foreseeable future (maybe 10 to 20 years time). This way the first 2 floors aren't underwater as soon of all the hotels in Kaanapali on the beach.