Reflective Earth estimated the potential amount of sunlight that could be reflected by the surface back to space using 30 years of hourly ERA5 reanalysis data–about 1 Terabyte–from the European Centre for Medium-range Weather Forecasts (ECMWF) Copernicus Climate Change Service (C3S). ERA5 is based on a state-of-the-art weather model that includes the effects of elevation, clouds, aerosols, and greenhouse gases. The value displayed on the map above represents the maximum amount of sunlight that could be reflected by Earth’s surface back to space averaged over a year. This also corresponds to the number displayed on the info box with the slider moved far to the right. A research brief describing the work we did is available here.