FILE -- The Seven Sisters cliffs at Birling Gap, England, Aug 17, 2018. A proposal to build two huge barriers, one that would connect Norway to Scotland, the other France to England, was described as a warning about the urgency of the climate crisis and together, the mammoth structures proposed by scientists would completely enclose the North Sea and offer protection for tens of millions of Europeans threatened by rising sea levels. (Andrew Testa/The New York Times)

Dam the North Sea

As sea levels rise, scientists offer a bold idea