The required "land" is already there... virtually everywhere, is typically dark and already absorbing solar energy (heat) in a counterproductive way.... use it. It dwarfs yer idea both in area and feasibility imo.
I can't take credit for this idea ... just pointing out what seems intuitively obvious to my dawg...
Woof, woof, roof
It early and I haven't given this nearly as much thought (none
) as you have tho'.
My dawg could be wrong and just wants to go outside.... need more coffee....