40% of the U.S. population line our coasts. That equates to approximately 130 million people residing in coastal counties. In addition to those who retire seaside, entire economies are integrated into the coastal industries of fishing, tourism, energy, shipbuilding, and recreation. Even a cursory glance using google maps shows how tightly clustered the built space is, all on only 10% of the total U.S. land mass. Shoreline communities have five times the population density as compared to the U.S. average.
