The nature:culture binary admix of an 'artificial' 2013 ash cloud made up of ‘natural’ 2010 Eyjafjallajökull ash is delightfully tangled in all the best ways. Experimentation and prediction are all we have, as humans, to try and understand earth processes. When Katla or Hekla do break out of dormancy, though, rather than hope for a fully predictable eruption cycle it does make a great deal of sense for airlines to have the ash cloud radar described in this release.