The Katla volcano has a reputation as one of the most dangerous volcanoes in Iceland, and it has exploded in the past just shortly after the activity of the closeby one that is causing all the mess now.
Katla has been showing signs of unrest since 1999 and geologists have concerns that it might erupt in the near future. Particularly, monitoring has been intensified following the March 2010 eruption of the volcano beneath the Eyjafjallajökull glacier. The eruption of this nearby long-dormant volcano in March and April 2010 prompted fears among some geophysicists that it might trigger an eruption at Katla.
Katlia could cause enormous disruption for very long period of times, even years. The ash cloud of today would be a joke compared to the cloud that Katlia could generate over all Europe and beyond.
Unfortunately nobody can stop this incredible force of nature.
A good reminder to us all, spoiled humans.