Not only that, but the energy is radiated in wavelengths that aren't absorbed by the atmosphere (I suppose it's different with cloudy skies). If this solution b

Not only that, but the energy is radiated in wavelengths that aren't absorbed by the atmosphere (I suppose it's different with cloudy skies). If this solution becomes massively widespread, it could have a good effect on global warming. With caveats: If we imagine a city radiating all its energy as infrared, it could cause weather abnormalities.