A reminder Sahara and Greenland going back to what they have been before.
Not the catastrophic scenario you are making up.
Nature comes back into balance fora given nutrient and food level quite quickly and yes starvation, pestilence etc are the tools used to get there with any overshoots being temporary measures. This sort of thing used to get taught in high school biology classes with fox and rabbit populations undulating alternately over time up and down.
