Eyjafjallajökull one year on: What have we learned

"Needless to say, the eruption of Eyjafjallajökull is going to become the textbook example of how a volcano will effect the modern, technologic society of the western world in the early 21st century. It brought some of the great superpowers to their knees with a few explosions and left many people wondering why governments around the world don't have a plan for volcanic disasters, even if you're a country like the UK with no local volcanoes of your own."

http://bigthink.com/ideas/37870