A new study explores a radical idea: building a dam across the Bering Strait to stabilize a major ocean current that helps regulate Earth's climate and is already slowing. CBC's Nicole Mortillaro explains why that matters and what a slowdown could mean. Climate researcher Jelle Soons says the dam is not a real-world plan, but a risky proof of concept. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/