Patrick Hunt is the President of the Climate Realists of British Columbia. In this short clip he tells us about his days in the Canadian Navy as a submariner and how, during the Cold War, as he submarine was pursuing and observing what Russian submarines were up to, they'd sometimes have to remain below for several days. During that time the concentration of carbon dioxide (CO2) in the submarine would build up to 5,000 ppm, but he said it had no ill effects. For more information about the Climate Realists of BC, go to their website. https://climaterealists.ca/ For more information about Friends of Science, or to watch our latest event videos, go to: http://www.friendsofscience.org