> 1. Could the green-house gases produced to launch a civilization to Mars be the final straw that breaks our eco-system's back? That seems very unlikely to me

> 1. Could the green-house gases produced to launch a civilization to Mars be the final straw that breaks our eco-system's back? That seems very unlikely to me. > 2. What are the moral implications of terra-forming Mars and moving a small population there, knowing that the population remaining on Earth is doomed? Even if we spent half of our resources on sending people to mars and hurting Earth's biosphere in the process, Earth would still be much more habitable than Mars. Heck, even worst-case scenarios for man-made climate change "just" reduce the areas where humans can live on earth (and that's a huge catastrophe for everybody), but there's literally NO PLACE on Mars where you can survive at all without pressurized residence etc.