We differ here. I do not believe we will ever be able to react quickly enough on any extinction level event by 'having another planet'. There is no fleet of rockets and pods and launching installations availble, nor will there be - we will never be able to select the designated survivors - they will not survive because we will not be able to 'colonize' any planet without outright war - we should use the available intellect and intelligence and capital to ameliorate the dire situation of the billions of poor people.

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