I’m curious purely from an engineering standpoint. What effect doest black asphault have on heat absorption versus having light gray concrete or green trees? Most buildings have some type of dark colored asphault / rubber shingles as well.
It seems like a first-cut approximation could be made if you knew the amount of the earth covered in asphault / roofs, and then compared the reflectivity / absorptivity of the different mediums. Is there any way to get some approximated numbers?
It may be that the % of land covered by roads is so small that it really makes a negligible difference to temperatures. That’s my bet, anyway. I just don’t have a quick and dirty way of proving it.