People don't talk enough about the threat to farming, on which civilization--literally: the existence of cities--depends. A city can be defined as a group of geographically organized people who produce no food (which includes the smallest village, not just urban areas). It is generally estimated that today at least 55% of all people on the planet live in urban areas--and that is expected to grow to at least 70% by 2050. So the number of people who live without producing food is substantially greater than those percentages.

For people to live without producing food depends on farming producing the necessary surplus of food. Farming has been around for a few thousand years of a stable planetary climate.

Today , people who do not produce food depend for their lives on a global network of food production and distribution. That network is fragile in the best of times. It will take relatively little in the way of weather-related disruptions to reduce it to rubble. If that happens, cities will collapse. People will flee into the countryside in a cascading avalanche of climate-induced horror.