Arctic Sinkholes I Full Documentary I NOVA I PBS

In the Arctic, enormous releases of methane, a potent greenhouse gas, threaten the climate. Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive sinkholes. In Alaska, a huge lake erupts with bubbles of inflammable gas. Scientists are discovering that these mystifying phenomena add up to a ticking time bomb, as long-frozen permafrost melts and releases vast amounts of methane, a potent greenhouse gas. What are the implications of these dramatic developments in the Arctic? Scientists and local communities alike are struggling to grasp the scale of the methane threat and what it means for our climate future. Official Website: Chapters 00:00 Introduction 02:22 Giant Sinkhole in Siberia 05:54 Evidence of Methane in Sinkholes 09:02 Alaskan Lake Bubbling 14:47 Effects of Permafrost Thaw on Climate 17:26 Native Alaskan Solutions to Permafrost 21:37 Organic Matter Impacted by Permafrost 24:44 Greenhouse Gasses