I for one desperately hope all efforts fail. There is nowhere mankind has gone where the result is not desecration, destruction, pollution and crass exploitation. We ruin everything we touch. The best equivalent model for our species is cancer. I despair and glad I'm old enough to not see the end result of our madness. (Apologies but feel very strongly about this)
Well yes and no, but I also feel its getting better. The big elephant in the room on the whole CO2 / global warming debate is what appears to be a complete failure to address the population issue, the main cause for the problems you mention. While its now obvious that the world population is forecast to drop, what is Australia doing about it? Answer SFA! We continue to provide welfare to encourage people to breed with +3 children per women families, although yes these larger families are also in decline. However why haven't we set a population limit for the country?
Back to Mars
The rover's job is to find either signs of former life or potentially maybe hibernated life.
If life had previously started but stopped, then mother nature is clearly more destructive than Man. Or maybe if life has never started on Mars then in both cases the planet is a dead rock and humans are free to go and live it up knowing nothing can be destroyed.
If life is still on Mars, then this is where it gets messy. Mars is by international treaty not a sovereign state nor can be claimed, so there will need to be some joint effort to protect the life on Mars and VV protect humans from it.
One way or another Humans are headed to Mars and we need to know if life is or was there, ideally before we arrive.
Something to think about.
Every footprint, tyre track left on the Moon will remain for around 1 billion years, is this pollution on a dead rock? Within 20 years there will be likely 1000's more than today. All the man made objects currently on the moon while still belonging to the country of origin (by international law), will remain for likely 100,000's of years. Likewise other man made objects left on Mars, Venus, Mercury, some of the moons in the solar system and of course about 4 or 5 objects that are leaving the solar system. Is this all polluton?