Alex Steffen: The shareable future of cities
Focus on building the dream neighborhood, not the dream home.
He gives the now-classic power-drill example (used on average for 15 minutes over its entire life, yet everyone has one. Because under our current pricing scheme, the convenience of ownership outweighs the horrible inneficiency costs). See also Rachel Botsman
If you make it so people would rather walk than drive –dense living–, then people don’t buy cars, which saves huge amounts of emmisions and costs (think: roads, parking lots, etc).
If you make buildings which are heated/cooled by natural forces, then you don’t need central heating systems.