Pollution:
https://www.nasa.gov/content/goddard/nasa-scientists-relate-urban-population-to-air-pollution&ved=2ahUKEwjJidiw0YPbAhXEY98KHfUbAvsQFjACegQICBAB&usg=AOvVaw3pPVOnD00e-RbLe2gmh4zL

Highest concentrations of pollution occur in population dense cities. Cities are a social construct.

Mass produced food where diesel is burned to power food production.

Few folks really wants to have the difficult conversation.