How did interstellar save mankind and the earth?

After understanding the data sent by her father through his watch, Murphy solved the gravity problem that Dr. Brand had never solved, so at the end of the film, human beings can live in the space station. However, the capacity of the space station is limited. If you really want to breed, you must find a new planet.

Ms. Brand went to her ex-boyfriend's planet and should be in good condition. Cooper woke up and started looking for her. The two of them can continue with Plan B and become the ancestors of the next generation of human beings.

The earth's environment has deteriorated and there is no way to save it. Everyone is trying to find a new earth.

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