The Cooper Station is able to sustain a healthy atmosphere and crops.

The fundamental motivation to get humanity out of Earth in Interstellar is the blight induced hunger. Moreover, in the movie they show a NASA lab where the corn is being infected with blight and they seem to have no way to stop it. It seems to me that whatever technology they used to achieve this result in Cooper Station would effectively resolve the plot.
Do we know how they achieved a healthy atmosphere and crops and why this couldn't be done on Earth?