The environmental gains come in when me and my 1500 neighbours don’t all go to the supermarket one by one, by car or even public transit, but the supermarket delivers a truckload of stuff to us at the same time. Saves the energy of getting 1500 people to the supermarket and back. Consequently, there are fewer people in the supermarket as well, so those are smaller, need less parking spaces, the city has less traffic and all sorts of knock-on effects.
The environmental gains come in when me and my 1500 neighbours don’t all go to the supermarket one by one, by car or even public transit, but the supermarket delivers a truckload of stuff to us at the same time. Saves the energy of getting 1500 people to the supermarket and back. Consequently, there are fewer people in the supermarket as well, so those are smaller, need less parking spaces, the city has less traffic and all sorts of knock-on effects.