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The biggest threat to mankind. What will end the world as we know ?

Does the world need to be saved ? Are we heading toward an inevitable extinction ? will that be a new generation bomb ? or will it be pollution ? will it be depletion of natural resources ? or will the machines be our killers as it is suggested in many sci-fi stories ?

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    Jun 22 2012: It doesn't appear to me that the world is going to end (at least not soon). But if it does, then probably our indifferent attitude towards this world will be the major reason. This world needs a little more caring, in terms of living a life that resonates with elements of mother nature.

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