1. Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space. It is a measure of the reflectivity of the earth's surface.
2. Albedo is a measure of the reflectivity of a surface. The albedo effect when applied to the Earth is a measure of how much of the Sun's energy is reflected back into space.
https://www.esr.org/outreach/glossary/albedo.html (1.); https://www.skepticalscience.com/earth-albedo-effect.htm (2.)
Author: Charly Krüger