But this is also a plea to town planners, architects and developers: if you want your design to be truly sustainable, leave space for trees, the kind that are wide enough to shade a garden table and six chairs. Go back to the old Canberra road system with trees down the centre of the highway, cooling the bitumen that contributes so much to our cities' heat... and start growing creeping figs up every concrete wall in Canberra, or let Creeping Boobialla cascade down from window boxes so Canberra looks green again, not shades of grey and glass.