Well, the end of the world as we knew it back then. A big double solar flare has missed us by a week. Should it have fired a week earlier in 2012 august 23rd we would have had all our electronics destroyed, sending us back to the stone age. We were darn close at that time. Such a big flare has hit Earth in 1859 and you could see auroras even in Tahiti.
What can we do to fight something like this? Nothing, just prepare. When such a flare comes back again, and such flare will hit the Earth in the next 10 years, we should simply turn off everything. Complete silence for a couple of minutes. Silence.