we have the SOHO satellite that monitors the sun and solar activity.
canada got hit in 1989 by a geomagnetic storm that took out one of our power grids causing blackouts in eastern canada and north eastern usa.
some, i want to say scientists but its not clear as to their scientific background(and they usually have a book for sale), talk about the earth going into a pole reversal and perhaps start spinning in the opposite direction, apparently it happens every 730,000 years and we are on the dawn of 729,999 years. but the only proof is weak based on things found in the earth stratus - if you can trust carbon dating. I have viewed some websites that go into detail about the effects of pole reversal but again they start out referencing the last pole reversal, that they have absolutely no tangible proof of, then slip in the Egyptian and Mayan writings, then amplified their points and try to get the reader to stop thinking of the fact that there is a big time gap between 730,000 years and when the Egyptians and Mayans actually walked the earth(they try to make it seem like they were around at that time but they actually were around 1,300 years ago for mayans and we still can't figure out proper timing for egyptians, it varies from 5 - 15 thousand years).
there are scientists that predict we have a 1 in 48,000 chance of getting hit by an asteriod(you have a 1 in 354,000 chance of dieing in a plane crash, think how many flights happen every hour on earth).
...oh, and don't forget about planetX, then there is the comet apophis, how about some nostradomas writings, sun spots, jupitor,sun,earth alignment, the antichrist, we have so many end of world options to pick from and you can donate to any one of those many, many websites.
But rest assured I wont sit back and let anyone take anything of mine without a fight
I would hope, if such an event occured, our first thoughts would be "how can i help my fellow man".