I'd actually argue that it is the opposite of a trade-off. The more houses that are built down town, the less urban sprawl will exist. One of the biggest cont

I'd actually argue that it is the opposite of a trade-off. The more houses that are built down town, the less urban sprawl will exist. One of the biggest contributors to climate change is everything that comes with urban sprawl, and high density housing fixes that. A basic example of the problems that urban sprawl causes is more transportation pollution. (IE, people who live near work are less likely to drive. Total average driving could be cut in half)