Prof. Brian Cox: "Carl Sagan said all civilisations destroy themselves at the stage we are at" He warns that civilizations like ours may never reach the stars because we destroy ourselves first.When you industrialize as a civilization you hit problems which are probably common to all civilizations. We're approaching that filter and it could be we don't pass through it.This is one of the leading explanations for the Fermi Paradox: the eerie silence of the universe despite its vastness. Advanced s