The problem is "just treat it a little better" is hard, if not impossible to do efficiently. The best we can do is make a carbon tax, and invest that money into renewable research and reversing co2 emissions. At the end of the day we have a choice. Lower living standards, or fewer people. We aren't willing to give those up, and for good reason. My point is that the course humanity is on, the process of destroying the earth, realizing we screwed up, and being forced to band "together" and fix it, will set the stage to give us the knowledge to do the same to another planet. Just as ICBM's and nukes brought us space travel and (closer to) world peace. We will never go to mars if we never have to. As things are going now, we will have to, or have motivation to.