I’m sure that any transition from Earth-like to the present state was so slow as to be unnoticeable even over centuries —- but it’s mind-blowing to me to imagin

I’m sure that any transition from Earth-like to the present state was so slow as to be unnoticeable even over centuries —- but it’s mind-blowing to me to imagine what it would be like to be, say, a nineteenth century civilization realizing you are in a race with the dying of your planet to get the heck off it.