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.
Even here in Europe where there are genuine left wing parties, where there’s proportional representation, where we have mistly functional education, labour class people are voting for folks who blame poor people and immigrants for everything that goes wrong. I think part of the blame is with tabloid style media and social media magnifying formerly fringe opinion. Just saying that having a real alternative for the populist right, might not be enough.