Surf these sites: Horizon - Supervolcanoes -- It is little known that lying underneath one of America''s areas of outstanding natural beauty - Yellowstone Park - is one of the largest supervolcanoes in the world. The impact of a Yellowstone eruption is terrifying to comprehend - huge areas of the USA would be destroyed, the US economy would probably collapse, and thousands might die. Horizon - Supervolcanoes: Transcript -- Full transcript of a BBC documentary on the threat posed by supervolcanoes, and how the danger was discovered. Supervolcanoes could trigger global freeze [BBC News] -- The threat of climate change caused by human activity could turn out to be a minor problem by comparison with a scarcely acknowledged natural hazard. Geologists say there is a real risk that sooner or later a supervolcano will erupt with devastating force, sending temperatures plunging on a hemispheric or even global scale. A report by the BBC Two programme Horizon on one supervolcano, at Yellowstone national park in the US, says it is overdue for an eruption. When Life Nearly Died -- Researchers link earth''s greatest mass extinction to Siberian volcanoes that erupted for a million years [TIME.com]
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