See http://www.bbc.co.uk/news/world-europe-29003031 .
It is now 3 years ago that we visited Iceland. It was a very lovely country and much greener than we expected with lupins in bloom all over the place. Volcanic activity is a constant threat and nearly wiped out the country a few centuries back. Today the threat is just as great, but now the implications for air travel could be substantial right across Europe. A big eruption could also result in severe winters and summers in Europe.