Make no mistake: Tackling climate change is vital. But to see everything through the lens of short-term CO2 reductions, letting our obsession with carbon blind us to the bigger picture, is to court catastrophe.
The brutal reality is that newer, more sprawling suburbs - and especially the cheap boom-years exburbs - aren't just a bit unsustainable, they're ruinously unsustainable in almost every way, and nothing we know of will likely stop their decline, much less fix them easily.
There's no law of physics that says we have to be an unsustainable society - in fact, quite the opposite. The planet's ready to work with us if we're ready to think differently, but we do have to make that jump and start to do things in new ways.
For carbon-neutral cities, there are things worth talking about in how our consumption patterns can change - sharing goods, etc. - but those are a fraction of the impacts of transportation and building energy use. If we need to choose priority actions, the most important things are to densify, provide transit, and green the buildings.
When the Internet really first started to hit, people felt this would be the death blow: after suburbs and long commutes and television and the death of the family dinner, this would be the last straw that would totally break society.
In almost all city governments in America, the small group of people who don't want change are able to block change.