i can't resist:
The city is our ark in which we might survive the environmental turmoil of the next century. Genuinely urban cities are the most environmentally efficient form of existing with nature that we possess because they can substitute public luxury for private or household consumption. They can square the circle between environmental sustainability and a decent standard of living. I mean, however big your library is or vast your swimming pool, it'll never be the same as the New York Public Library or a great public pool. No mansion, no San Simeon, will ever be the equivalent of Central Park or Broadway.
i suppose the difference is that you have to share the public pool and the library. the extent to which individuals are willing to turn more towards shared spaces and amenities will largely dictate how the circle is squared.