If we can't fix our own planet from our (so far) relatively minor degradations, we have no hope whatsoever that we can expect to completely change another planet without our copious earthly resources around to help us.

It's a bit like the announcements "Wow! We've found a planet that we could live on easily!". The only problem being that planet is 'only' 200 light years away. Two hundred light years. It's going to take the Voyager space craft thousands of years to reach an equivalent distance of the nearest star which is but a mere FOUR light years away.

Whistling in the wind.