One could argue that human civilization has done some extreme damage to our environment. Every day we hear about plastics in the oceans, and species of life going extinct because of the impact civilization has on habitat.
Meanwhile, billionaire entrepreneurs and scientists talk about having a multi-planet civilization in the future. Some even say our survival depends on it. But we would first have to thrive here long enough to establish the capacity to create a civilization on another planet. How can we do that when we are destroying the ability for Earth's ecology to support life now? We need a longer-term perspective along with a better understanding of how biological systems work.
It's easy to produce things for the market; however, it might be a lot harder to develop a global socioeconomic system, and the political institutions undergirding and supporting it that would make a sustainable future possible.
We need to determine what's most important to our lives now and what we can do now to guarantee we'll have a healthy society on a healthy planet for a long time to come.
If we wanted to, we could reverse the damage we have caused with our hyper, market-oriented consumer culture and head in a different direction. We could, in short, terraform the Earth and make it an even better habitat for life. It would be a heck of a lot easier to conserve our Planet than to terraform Mars. At any rate, our global civilization would have to survive at least another couple hundred years before we'd have the technology and scientific knowledge to do something like that.
Let’s get our priorities straight, shall we?