You know when we first started seeing growing populations and development of agriculture? When the climate started an exceptionally long stable period. Guess what’s going put of the window now? Planting for draught because that’s the “new normal” won’t get you far if the next year happens to be the wettest on record. Let alone that stronger storms than ever seen before aren’t exactly great for harvests either. And that’s just agriculture. Climate related disasters can wipe out key infrastructure, with unexpected consequences down the line (e.g. no car production because of a certain specific part of almost all cars comes from that one specific place). And then there’s the refugee problem on top of all that.