I've seen it already on TV.
i suspect thatas a society we have invested so much in technology there's no going back. if a neutron or plasma bomb or whatever goes off, we won't have a fall back position.
well, most of us won't, but a few of us might?
STARting from scratch would not be an easy task. without distributed fuel, electricity and food supplies, adapting to a fast & furious change would be detrimental to one's well-being.
maybe we'll know how to get to Mars before it's too late?