Once the current travel mess gets straightened out, there’ll be some other things to worry about.
First off, as the dust and ash settles downward, people with respiratory problems will have to be careful. The World Health Organization has already issued a cautionary advisory.

Then there’s all the sulphur dioxide that’s in those clouds – it’s the basic ingredient for acid rain, and there’s a lot of it floating around up there.

Finally, the Icelandic eruption isn’t the only one going on. There are several active eruptions in various parts of the world. They just don’t happen to be in the way of major flight paths, and so they haven’t merited a lot of attention. Nevertheless, they’re spitting up their share of volcanic ash.

In the past, notably 1783 in Europe and in the early 1800’s in the eastern U.S., volcanic ash from major eruptions caused a serious change in the climate, so much so that they both came to be known as “The Year Without a Summer.”

There were frosts throughout the summer, temperatures were unseasonably cold, the result of large clouds of volcanic ash drifting through the atmosphere. Crops were severely damaged, and there were reports of famine.

All we can do is wait.