Eye of Meteor

Do we really know enough about the Earth? Who will become the leader of the earth after humans move away from the earth? How many years can the earth last? Suppose that 300 years from now, we have suffered the consequences and the earth is no longer suitable for us to live in. We leave here and explore extragalactic galaxies. Can the self-regulation system of the earth be adjusted and reversed at that time? Taking the home planet millions of years from now as the stage, what can we get a glimpse of?