Australian cities cannot continue to grow in the manner to which we've become accustomed. The environmental, social and economic costs are simply too great. There needs to be a qualitative change to the way we build and live in them.
New Zealand is not only snake less and nuclear free but also has a tradition of earth buildings. In pre European times, Maori utilised the ground's insulating properties by partially sinking thatched roofed houses into the ground.