I’d like to pose an interesting debatable question here: If every human on Earth were to disappear, how would this affect the global climate? Would it become better, and if so, how long would that take? I personally think that the natural environment would eventually return to a stable state, but the damage that we’ve caused is bad enough that it might take several hundreds or even thousands of years to do so.

This is a more complicated question then most people think. It would be very damaging in the first month or so, but obviously benefitable in the long run. there would be permanent things that will almost never go away, sure as mount Rushmore. Here is an interesting video to watch on this subject.