Can volcanic eruptions devastate entire continents – with poisonous gas for example?

Summary:  The recent eruption of Eyjafjallajokull in Iceland has prompted increasingly fevered discussion about the danger of a future eruption — perhaps by Eyjafjallajokull’s sister, Katla.  Might an eruption expel volcanic gases that poison much of Europe?  Just like Laki did in 1783-84.   Or not.  The stories have grown as they circulate around the Internet, …

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