Spoiled brats aren't good at empathy I guess. Civilization emerged in the last 10k years or so because of climactic conditions. Before that, shiz was regularly cray cray. Even .1MY ago shiz was messed up bad in terms of supporting nice stable large populations. Agriculture? haha no, enjoy glaciers. Go back farther than that and the magnitude of disaster is regularly Lovecraftian. The thing you're taking for granted is that you have any conception of what the deep past looks like whatsoever. Wiki it around a bit; use your imagination. absolutely terrifying. Trees not regrowing is a super normal thing to happen when climactic patterns shift. Ever wonder why they built the pyramids in the desert? It should be obvious: didn't used to be a desert. Common theme in archaeological sites: surrounded by barren waste. That's microclimates and water flow, but again, stimulate your imagination. The past isn't going to come up and beat you over the head, but the future friggin is.