Something about correlation and causation comes to my mind. When you start an article listing all the known causes and they all relate to a high income (people

Something about correlation and causation comes to my mind. When you start an article listing all the known causes and they all relate to a high income (people in cities have more money, people in richer countries have more money, people with better education have more money, people with electricity have more money), why would you just dismiss this relation and claim that it's something else that seems to correlate nicely with high income as well (cities have more lights, richer countries have more lights, people with better education have more lights, people with electricity have more lights)? Surely a proof that high income is not the root cause is needed here. Also, I don't really see the supposed collapse of birth rates after 2015, at least it doesn't seem half as drastic as those in the 70s (which can be explained by people having more money) or the ones caused by war.