We have to stop building parking lots everywhere, stop building flat top highrises, stop using concrete and steel, build everything with roofs designed to absorb heat and transfer it into the ground instead of radiate it, tear up a good chunk of the highways, parking lots, and surface streets, plant tons of trees and broad leaf greenery to shield from heat with shade and absorb it, and refill the water tables by pumping water back into the ground. All of which costs a ton of money. And what we should do, damn the financial cost and those who decry it.
Slapping a Mickey Mouse Band-Aid onto a gaping wound that needs seventy two stitches is the equivalent of what people suggest when they say "Well I'll just use renewable energy."
Read Bill Gates' "how to avoid a climate disaster" for a complete rundown, with receipts.