Certainly that could be the answer for some or part of them, but we should also be looking at building housing on top of them as well. Heat discourages people from walking but so does the distance between destinations.

This may seem counter to the goal of reducing emissions, but if it means there's less low-density development at the fringes (which involves a lot more roadway, etc per person) then it's really not.

Of course, it's not either/or - there's plenty of underutilized land devoted to parking, we can do both!