What will kill off mankind?

Geomagnetic storm. The last big one hit us in 1859 (The Carrington Event) and wiped out the telegraph system. A similar one today of the same magnitude would probably cause our electricity system and supply to be severely damaged for years if not decades.

How often do they occur? Forecast doesn't look too good for the rest of the week


Has there been some sort of doomsday programme on TV or something? 2 threads along these lines in half an hour.