This is valuable reading.
In the summer of 1995, a blistering heat wave settled over Chicago for three days. It killed 739 people, making it one of the most unexpectedly lethal disasters in modern American history.
Throughout the city, the variable that best explained the pattern of mortality during the Chicago heat wave was what people in my discipline call social infrastructure. Places with active commercial corridors, a variety of public spaces, local institutions, decent sidewalks, and community organizations fared well in the disaster. More socially barren places did not. Turns out neighborhood conditions that isolate people from each other on a good day can, on a really bad day, become lethal.