Volcanic ash an air traffic-stopper but not a climate or health hazard

Unless there's a big change in the amount of material emitted by the Icelandic eruption, long-term effects are unlikely, scientists say. The ejected material has been known to stall jet engines. The massive ash cloud from an Icelandic volcano is pretty much a run-of-the-mill ash cloud that is a concern primarily because of its location and the prevailing winds, which are forcing the...

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