Asteroids?
http://www.umich.edu/news/?Releases/2005/Aug05/r081605c
Global warming could well be the cause of very scary weather but too many people have a shallow appreciation of the undebatable violence of the Earth’s weather history.
Over ninety nine percent of all species that have lived on earth have already gone extinct from mostly severe weather without any human factor to account for. http://www.nhm.ku.edu/woodpecker/dodo.shtml
Human history is a incredibly brief and unusually peaceful period of weather on Earth.
It may seem morbid but is it ever too early to prepare for the next super caldera volcano eruption, ice age, or asteroid that will impact the Earth?
Are we prepared?