Sunlight-reflecting “cool walls” reduce energy costs by lowering heat gain in buildings. But they can also cool cities by fighting the urban heat island effect. The U.S. Green Building Council has issued a pilot credit for the installation of cool exterior walls in new homes, schools, and buildings. https://newscenter.lbl.gov/2021/05/18/cool-walls-get-a-boost-from-u-s-green-building-council/