Synopsis: The eruption of Iceland's Eyjafjallajökull volcano in 2010 turned much of the northern hemisphere into an ash-strewn no-fly zone. Katla, an Icelandic volcano 10 times bigger, has begun to swell and grumble, and Hekla and Laki, could erupt without warning. Iceland is a ticking time bomb: When it blows, the consequences will be global. What can we do to prepare for the coming disaster?
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