Government should be active and in charge of urban planning. It is a matter of the common good.

One of the biggest problems today is that urban planning has basically evaporated. Local and state governments don't plan towns anymore. Things are left to developers who have no other concern than to run a street off a major road and plop a few houses down, sell, and move on to the next project. No thought is given to traffic or public services or walkability or public transportation. No care is given to integration with existing urban structures. Instead of mixed-use zoning or building houses around a common public space, which are historically the more common and sensible form of urban planning, we end up with car-dependent suburban dead zones, suburban sprawl.

This should be receiving more attention from environmentalists, as urban planning is intimately related to environmental issues.