Watched a documentary last night about Yellowstone Volcano, the area where the national park now stands is actualy the crater of a very active volcano that has erupted before ( the crater replaced a mountain range in the same spot ). They found traces of the ash from that eruption as far way as New York and Mexico, and calculate that if it erupted today it would wipe out most of north America and have a major impact on the whole world, climate would cool rapidly due to ash in the atmosphere ( the ash and debris would fill the Grand Canyon twice over - don't know how many Olympic size swimming pools or how many times the area of Wales that is ).
I am gonna start worrying over that now, more real than global warming / climate change / or whatever they are calling it nowadays....
