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Jeffrey Lewis, an arms control scholar, wrote in Foreign Policy in 2013, "(the) EMP Commission exposed 37 cars and 18 trucks to EMP effects in a laboratory environment. While EMP advocates claim the results of an EMP attack would be "planes falling from the sky, cars stalling on the roadways, electrical networks failing, food rotting," the actual results were much more modest. Of the 55 vehicles exposed to EMP, six at the highest levels of exposure needed to be restarted. A few more showed "nuisance" damage to electronics, such as blinking dashboard displays."
Defending against a single nuke or even several is possible these days. However, If N. Korea was able to build a weapon with M.I.R.V. technology , then they would have a first strike weapon which might be next to impossible to defend against. The experts were surprised by their ICBM launch, what other surprises are they working on .Damon wrote:
Making a nuke mess is hardly high technology in this era. In fact as is implicit in what gator said above, an ICBM and an even an explosion are really not essential. They are impressive but not absolutely necessary for putting the enemy out of commission. Of course the plan may be self defeating.