2) what is the combined albedo of the earth and the atmosphere?

Explained

Explanation:

Albedo is the proportion of incident light or radiation that is reflected back into the atmosphere typically in planet or moon. The Albedo of Earth surface is about only 4% and the combined Albedo of   the Atmosphere and the Earth is about 30%. This Happens because of the high albedo of the Clouds and low albedo of water.