Detroit Michigan is 138 square miles in size with a population of just under 700,000. Paris France is 41 square miles, with a population of 2.2 million. There are two large parks in Paris, Bois de Boulogne and Bois de Vincenness, which combined are more than three times the size of NYC’s Central Park. If densified, Detroit could fit Paris three times over, with a population of 6.6 million people, have nine versions of its own Central Park, and still have over 15 square miles of land to play with. Vertical aquaponics can grow up to one million pounds of food annually per acre. There are 640 acres in a square mile. That comes out to 7.6 billion pounds of food grown per year within the city boundaries of Detroit. The average USian eats 2,000 pounds of food a year. Thus Detroit could grow enough food to feed 3.8 million people. If you were to add in rooftop farming, Detroit could feed even more people. In total, to fight climate change and prevent further zootonic pandemics by reversing urban sprawl via densification of cities, Detroit at Paris density levels could house 6.6 million people, have nine Central Parks, and grow enough food for nearly four million people. Not to mention, such a Detroit would have a world class public transit system.