Brightening clouds. Refreezing the Arctic. Floating a giant parasol in outer space. To the ranks of out-there ideas for countering climate change, two Dutch scientists have added this: building a 50-mile-long dam across the Bering Strait, the shallow waterway that separates Russia and Alaska.

In a study published Friday in the journal Science Advances , the researchers show that, under certain conditions, such a dam could prevent a collapse of a network of ocean currents , known as the AMOC, that plays a central role in regulating Earth’s climate.

A satellite view provided by NASA of the Bering Strait, which separates northeastern Russia and Alaska, in summer.…