Light-colored building envelopes reduce cooling load. Dynamic albedo (electrochromic or thermochromic surfaces) can adapt to seasons.
The 2023–2024 climate data has alarmed scientists because global albedo appears to be falling. Record low sea ice in Antarctica (whose surrounding ice acts as a massive mirror) and reduced low cloud cover in the Atlantic have dropped Earth’s reflectivity to the lowest levels in decades. Since less energy is being reflected, more is being absorbed by the oceans, accelerating warming further. Albedo
This self-reinforcing cycle is one of the primary reasons why the polar regions are warming significantly faster than the rest of the planet. Common Earth Surface Albedo Values Surface Type Typical Albedo Range Fresh Snow 0.80 – 0.90 Deep Ocean Water Desert Sand Green Grass 0.05 – 0.10 Albedo in Astronomy Light-colored building envelopes reduce cooling load