Big cities already periodically provide “Cooling Centers” to support the large population of working poor who can’t afford the sky high energy bills. I have no idea what rural communities do during a heat-wave induced brown out. Everyone gets in the lake that’s full of industrial agricultural run off? They retreat into the mines, like a bunch of Morlocks? Y’all just fucking die?
But this is entirely unsustainable long term. Either we find a way to keep our large populations cool during the killer hot months or we stop having large populations all together.