Making Venus habitable: Start by siphoning off the atmosphere.
  Use self-replicating nano swarms that break apart the unwanted
  bits off of the molecular chains and carry them out of the
  atmosphere towards the sun. Mind you, this would require some
  severely efficient energy storage - perhaps something akin to a
  complicated electron maze... although at this point, we should
  be FAR BEYOND electrons and being able to harness the energies
  inbetween the "electron shells" and THEN harvesting the released
  ions as well. Total science fiction, but then again, so is most
  of theoretical physics :P*** -Kenneth Udut