<p>A man walks through floodwaters from Hurricane Irma in Bonita Springs, Florida.</p>

A man walks through floodwaters from Hurricane Irma in Bonita Springs, Florida.

Photograph by Mark Wilson, Getty

Sea Levels Are Already Rising. What's Next?

Climate change is battering coasts with storms and floods, but we still haven’t grappled with the risks of what’s to come.

When National Geographic caught up with Goodell at his home in Saratoga Springs, N.Y., he explained how water contamination is one of the greatest threats from rising seas; why poor nations are demanding compensation; and how President Trump’s policies are causing people, and states, to push back.

What Governor Scott’s remarks say is how poorly we understand the risks of what we face now and in the future. The idea that areas flooded that we didn’t think could flood suggests we don’t have a very good sense of what the risk is along the coastline, especially in Florida where we’re continuing to build out at an incredible pace.

It also suggests we don’t understand the risks we face in a world where

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