Urban density in a green world SMART urban planning comes down to QIMBYs, dogs, babies and tomatoes. Well, there's more to it than that but essentially, Canadian city planner Brent Toderian says, it's about arriving at a vision that is environmentally attractive and encourages social cohesion. A vision that's followed through no matter which political party is in power. So NIMBYs (not in my back yard) need give way to QIMBYs (quality in my back yard), and density - the oft maligned D-word - should be embraced as the answer to all things wrong with today's urban development. As for the dogs, babies and tomatoes, they're three things guaranteed to get neighbours talking to each other in a park, courtyard or communal garden.