On another random thought track, walking along a deserted train platform as the train company reduced their services and the trains in service are buckling under this heatwave, I wondered if the doomsday preppers inadvertently got it right for the wrong reasons.
The earth is getting drier and food will become more scarce. Having a decent sized bunker underground with enough food to last one or two generations and enough weapons to defend it from all but bunker buster bombs may result in them surviving heree others fall, and fornicating a brave new world..