 Environmental issues, this is one where, again, Ed Glazer, together with Matt Kahn, has done some very cool work, showing that actually new construction has a lower carbon footprint than old, because even though it's bigger, it's much better insulated. Furthermore, the areas of the country that are nicest in terms of weather conditions, Southern California most notably, these are places that have very low heating and cooling costs, and yet also, perversely, they have regulated...