From Norman Wells:

Re: Study: Earth to be livable 2-3 billion years more, but not for all (Sept. 17, 2013): Recent information suggests that is increasingly likely that life on Mars is extinct and may well have been so for a very long time. It seems possible though that if life did exist there in the past it may have reached the levels of intelligence that we have, here on Earth, several millions of years earlier than us ‘For in the time span concerned a race of intelligent humanoids could have lived on Mars and become extinct or moved to a new home, along with all other living things, possibly from the exhaustion of its resources. It may be that they eventually migrated to Earth and that we are their descendants. But the suggestion that we could eventually move back to Mars seems pointless if as I suggest its resources were plundered in earlier times. This makes it more likely that eventually we may have to leave the Solar system and look for a new home elsewhere in Space. Consequently if this proves to be the case, the need exists to search diligently in the future for ways of overcoming the limitations imposed by the Speed of Light to enable Space exploration to be undertaken in

times more compatible with our normal life span ;or that life span needs to be greatly increased. . It is inconceivable that we should attempt to travel across the Galaxy. much less the Universe, with the present limitations in place. If indeed intelligent life did exist on Mars millions of years in the past why should it have taken so long to evolve on Earth. Or if we are descended from Martian migrants ought we not to be much farther along the path of human development than we actually are now ? Perhaps there were earlier forms of humanoid intelligences which evolved on earth and became extinct before our time, Maybe there were even intelligent Dinosaurs !