I'll leave to pros to come up with accurate estimates, but it doesn't seem hard to back the intuition that higher density let's your save on a bunch of duplicat

I'll leave to pros to come up with accurate estimates, but it doesn't seem hard to back the intuition that higher density let's your save on a bunch of duplicated infraestruture, services, goods, and energy expended on driving things across distances. Also, sprawl invariably increases human territory in areas that could be left for wildlife