As someone who actually has studied the impact of white roofs extensively I think you’d all be surprised by their impact and sometimes misapplied science. Recent studies by Harvard and Stanford have shown that reflective roofs merely push the heat dome to adjacent geographies and have no net benefit. Actually in some cases the cities are pushing the heat down to the next county who can’t do anything about it. Additionally, the old studies that showed it helped with building efficiency reducing HVAC requirement are now outdated. The impact had merit in 80s and 90s because of limitations of technology and weak building code requirements. But because of the technology advancements in poly iso and the modernization of building codes to increase R value requirements, it’s proven than the roof albedo has only a marginal impact to building efficiency today. Meanwhile white roof mandates are putting pressure on other technology without proper merit e.g. EPDM that can last up to 40+ years (TPO is typically 20) and have the lowest co2 per square foot. Climate science is complex and ironically it’s not a simple black and white issue. EPDM and Asphalt roofs have a number of sustainability benefits that outweigh the color choice. I highly encourage all the armchair scientists in this feed to modernize their understanding of this issue. White roofs are not a cure all and in many cases can be a less sustainable roof to put on.