MasterBlaster76
ICC Chairman
I have heard on the news that in 2012/2013, there is a very real possibility that the Earth could be hit by a solar flare that will cripple electricity and things like satellites and communication - to all intents and purposes, sending the Earth back to the Dark Ages. 
Here is an article about it:
Nasa Warns Of Super Solar Storm 2012 Socio-Economics History Blog

Here is an article about it:
Nasa Warns Of Super Solar Storm 2012 Socio-Economics History Blog