If we can terraform other planets to look like Earth, why dont we terraform planet Earth back to what it was like before? I think its because of a very simple reason. Its to “expand”. The main reason for wars is and most likely always will be “land”. And thats because, the more land one has, the more power they have. We have used our planet to its limits, and it seems easier to go to other planets than to fix our mistakes. This is a problem. A serious problem, but sadly there isnt a solution to this problem. Long story short, humanity has always been greedy and always will be, and there isnt a solution for this. Have a great day!