The argument about doomsday asteroids etc is the wrong argument to take, it would still be much easier to survive on the earth even after several killer asteroi

The argument about doomsday asteroids etc is the wrong argument to take, it would still be much easier to survive on the earth even after several killer asteroids than to survive on Mars or another planetary body. Even if you build your mars base here tomorrow, lets say in Antarctica, nobody has yet got the closed loop environment problem solved as far as I'm aware and supplies will still be required from outside. Saying that I'm bullish the Human race will become inter-planetary in the next 50 years and wish those working to make it happen the best of luck.