lets just migrate to another planet that has oxygen and probably that will be Mars.
An atmosphere like that exists in the earth is not found in any of the exoplanets in this universe. But a large part of the universe is yet to be explored. I just hope that one day someone will discover a planet, which is similar to the earth.
Well, as it so spoil one planet and then go on to take a crap on the other? It's wrong. We need to take care of their planet. Everyone should make this effort