The Deltaworks project did not have a trivial cost, and the Ministry of Water in the Netherlands is deeply concerned about how we will mitigate further sea level and river level rises.
Roughly 1300 Euros per person protected. How much would it cost to move those people? And what is the total value of the real estate where they live/work/farm?
So yes, "Building sea walls is a trivial cost compared to moving (and giving up the real estate to the sea)."
"The South Holland coast region is home to approximately 4 million people who live below normal sea level" https://www.ice.org.uk/what-is-civil-engineering/what-do-civ...
Roughly 1300 Euros per person protected. How much would it cost to move those people? And what is the total value of the real estate where they live/work/farm?
So yes, "Building sea walls is a trivial cost compared to moving (and giving up the real estate to the sea)."