And EMP is by far one of the plausible, if not possible forms of really messing things up. Whether its a natural one caused by solar flares or an attack using a tactical nuke, denonating 300 miles from the surface; the results are quite horrible.
Most of the modern world, and especially Americans have become so reliant of electricity. Foods and important medicines rely on cold temperatures to extend shelf life. Those with illnesses that require these types of meds will run out.
Those who are aware of the implications of such an event you don't need me to tell you all the things that will go wrong. For those who are aware I urge you watch this short clip - do your research and start preparing...
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