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Originally Posted by Dr Vivisector,
I remember reading a while back that fifty nukes would be enough to extinguish life on Earth via nuclear winter and climate destruction. Why bother building a shield when everyone's going to die--even if they miss?
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The stuff I read on this subject was read a long time ago, but the thrust of it was that a songle nuclear warhead exploding will kill a lot of people, and then leave a cloud of fallout behind. This cloud will grow to a certain point, and then depending on wind conditions move around a bit.
So, say if a nuke exploded in Germany. French and Italian people wouldn't die right away, but they would be packing their shit and moving out.
Obviously, such a cloud of death would bring holistic damage to the planet's environment, but nothing like extinction.
Also, stopping an ICBM on its tracks isn't that dangerous. For one thing, it'll detonate during sub-orbital trajectory, if it's hit, and for another it probably won't be rigged to explode until it reaches its target.