A geologist, such as yourself, knows that the coast of California is tectonically active and would not be a good measure of a constant elevation.Sure, look up Sunset Cliffs California (San Diego). They have photo's from 100 years ago and just last year. No change. You can do the same with every coastal city out there. They almost all have photo's of the shorelines. Compare them. No change.
Businessmen make decisions based on business NOT science. If an airport will turn a profit in 10 years and will not be underwater for 50 years, it is still a great investment. Not surprising a geologist doesn't know that.Businessmen make decisions based on science. Funny how a supposed geologist (you) don't know that.