I have walked the entire way around Oahu 7 times now in the past 12 years. The changes in the shore line are shocking and clear. North near Hauula, we will have to rebuild roads in a matter of years., like 10 or less. The sea is already removing the sand away from under the roads and the area has to be rebuild every few years to keep it stable.

Along the Waianae coast, there USED to be a railroad than ran the entire way around Kaena point over to Haleiwa.  If you walk the trail, you can see rail road ties sticking out the side of the hill over the ocean, where the railroad USED to be. now there is just ocean.

This section of track no longer exists. Half of it is in the ocean.
https://s-media-cache-ak0.pinimg.com/originals/c2/e0/9e/c2e09eb00f88e9d5701bda01e7687ee3.jpg
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The entire point is that if we do not stop building right next to the ocean, we will be rebuilding again in a few years.. Personally I don't think there is any way to change it, we need to change us.