The sun burps every so often and throws out an EMP.

We've become so reliant on computers that the next time it does most people will die.

Western nations no longer have a homogeneous society, so forget the clubbing together and singing songs like during WW2, it will be dog eat dog. Places like Japan would work together for the common good, it helps they have high IQs too.

If you want to survive you will need to be in a like minded community far away from any city, preferably somewhere no city dweller zombie could walk within a week.