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Some scientists have predicted that a gl...

Some scientists have predicted that a global nuclear war on the earth would be followed by a severe 'nuclear winter' with a devastating effect on life on earth. What might be the basis of this prediction ?

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The elouds produced by global nuclear war would perhaps cover substantial parts of the sky preventing solar light from reaching reaching many parts of the globe. This would cause a .winter., against which life on earth cannot withstand.
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