Pack them in the cities where they can more easily be controlled...
If cities were actually greener than the suburbs they would be cheaper to live there. The truth is the greenest and happiest living occurs in the green countryside. Soon self driving cars and aircraft, high speed rural internet, online shopping and entertainment, and robotic farming will make living next to nature and voting conservative the next big in-thing.
The first terrorist nuke or 3-D printed virus that takes out a city is not just the end of communal city living, but also the end of voting Democrat.