It's not a binary situation. There is a medium between the high rises of Manhattan and the large single family homes of the suburbs.
More to your point, dense cities can be much more sustainable than suburbs. Money spent on infrastructure benefits more people. People living in apartment buildings use less energy for heating and cooling. Commuting doesn't necessarily require a car so you use less fossil fuels.
More to your point, dense cities can be much more sustainable than suburbs. Money spent on infrastructure benefits more people. People living in apartment buildings use less energy for heating and cooling. Commuting doesn't necessarily require a car so you use less fossil fuels.