This is an excerpt from the May 11, 2020, episode of What's Up With Water. This episode looks at a study pointing to groundwater as the biggest flooding threat to Honolulu as the seas rise.
Building a wall seems like an intuitive way to protect a coastal city from rising seas. Ocean barriers date back to ancient times. But the intuitive response can be the wrong response, say experts, when the obvious threat is not the greatest threat.
