Nature's Secret Weapon: Super Pandemic(s)
Have you ever tried to climb up the stairs to the 60th floor in a building where there is not enough energy to run the elevator? Then when you get there you find there is no air conditioning because there is not enough electricity.
Large urban centres are going to collapse once the reality of energy shortages kick in. But architects have no understanding of this. They get paid to produce drawings and if the building becomes unusable 10 years later, that's someone else's problem.