Maybe we should have a prime directive for future terraforming...but that's more of an ethics problem.
CJ
We cannot find agreement on real life problems here on earth - even among friendly nations let alone some kind of agreement on Mars e.g. global warming.
Corporations and corporate titans like Musk will likely be on Mars far earlier than any kind of agreement can be reached. They won't give a shit about contamination of another planet. Shit most of them don't care about the one we live on now.
I read something somewhere on the internet by a kennedy saying something about a "wait" differential or something, it's a theory that says that we would have an approximation of 1000 years from today until interstellar travel is "feasible". (I honestly give it 300 to 500 years). The solar system is moot at this point, much like a college dorm possessed by fratboys moving out of our parents house for the first time. It's going to get messy.
Hopefully we will have wizened up by the time we go interstellar.
Then again, that means we would have to abandon the current concept(s) of God,(Much like a naive young child no longer believing in Santa Claus(FAT CHANCE!)), politics, business, nationalities, military...well about 90% of everything that we would consider the backbone of our current civilization. Yeah, any type of
prime directive will never happen in our lifetime, but we can at least plant the seeds for our future generations to figure out something.
Also, just a thought you could leave all those people who don't give a shit about earth on earth, then take the best and brightest off earth. Finally, you could quarantine the planet until they figured it out and fix the bloody planet, or you could cause a nuclear holocaust as an easy if not completely and totally inhumane, the most unethically evil thing you could do.
Well, that was a tangent.
Putting the possible implications of mass genocide that's inside my head aside. I think that the people on Mars, in the end will be better off, frankly because unlike Earth, whose environment on the whole is gentle to us, our biggest enemy will be just surviving on the hostile environment that is Mars. I'll elaborate more but I'm really tired so I'll finish any of my thoughts on this later.
CJ