My sister's boyfriend is a geologist too and he will participate in a congress of glaciology in Iceland but now does not know yet if it will fly.
The eruption of the Icelandic volcano is just a small “burp” compared with what it really might happen to the whole world if the immense caldera sleeping beneath Yellowstone National Park suddenly decides to wake up.
This explosion would have global repercussions and would lead to extinction.
We must remember that:
"Civilization exist by geological consent, subject to change without notice"
This illustration shows the estimated extent of significant ash fall that would result from a major eruption of the Yellowstone caldera, reaching west to Portland, north to Edmonton, Alberta, east nearly to Sioux Falls, S.D., and south to the outskirts of Las Vegas.
(picture taken from discovery.com)
I've scared you enough?