@breadandcircuses Put white or aluminum flake paint on black roofs and install white sheet roofing when it's time to replace. This increases roofing lifetime and keeps buildings cooler. And unlike trees, reflective roofs send solar radiation back into outer space. Dark surfaces absorb light, heat up, and emit infrared. A significant part of that infrared is trapped by atmospheric global warming gases.

Also, some really hot cities are painting pavement with white paint for the same reason.