Nova: Doomsday Volcanoes

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In April 2010, the eruption of Iceland's Eyjafjallajökull volcano turned much of the northern hemisphere into an ash-strewn no-fly zone, stranding hundreds of thousands of travelers. But Eyjafjallajökull was just the start. Now, an Icelandic volcano ten times bigger, Katla, has begun to swell and grumble. Two more giants, Hekla and Laki, could erupt without warning. As CGI takes us inside these geological monsters, meet atmospheric scientists who are working to understand just how devastating an eruption could be - not just for air travel but for the global food supply and for Earth's climate. Could we be plunged into years of cold and famine? What can we do to prepare for the disaster to come?
Volcano Threat (1:42)
Sponsor Message: Nova (0:49)
Eyjafjallajökull Volcano (1:49)
Iceland Geology (2:02)
Iceland Geography (1:31)
Inside a Volcano (3:37)
Iceland's Volcanic History (3:15)
Laki Eruption Fallout (3:14)
Volcanic Sulfur Cloud (2:32)
Volcanic Sulfur Health Threat (5:41)
Volcanic Vapor Patterns (2:17)
Sulfuric Cloud Scenario (2:11)
Stratovolcanoes (3:41)
Volcanic Ash Cloud (1:52)
Volcanic Ash Scenario (3:11)
Katla Threat (1:20)
Monitoring a Volcano (2:59)
Katla Eruption Scenario (2:22)
Volcano Climate Effect (1:31)
Ash Detection System (2:47)
Volcanic Impacts on Modern Society (2:02)
Credits: Doomsday Volcanoes (1:21)

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