A preliminary study suggests that blocking off the waterway between Russia and Alaska could help the survival of a key system of ocean currents. But there could be potential unforeseen consequences, particularly to marine ecosystems The Bering Strait is a narrow waterway between Russia and Alaska that connects the Pacific and Arctic oceans. Ocean Color / NASA Damming the Bering Strait, a narrow waterway between Russia and Alaska, could prevent the collapse of a crucial network of ocean currents, according to a bold geoengineering proposal from two Dutch scientists. The work, published in the journal  Science Advances  on April 24, suggests that closing a roughly 50-mile-wide passageway between the Pacific and Arctic oceans could extend the lifespan of Atlantic Meridional Overturning Circulation, or AMOC. The current system plays an important role in regulating the Earth’s climate, but it’s under threat due to the world’s warming. The AMOC acts like a  water conveyor belt .…