1. The problem statement, all variables and given/known data I learned that the solar radiation entering the atmosphere heats up the earth's surface and the heat then radiates from the surface to the rest of the atmosphere. Is the greenhouse effect mostly dependent on the heat radiating from the surface, or do the greenhouse gases absorb a good quantity of heat as well when the solar rays move through the atmosphere? 2. Relevant equations NA 3. The attempt at a solution Since the solar rays have to pass through a good amount of atmosphere to get to the surface, it seems like a lot of radiation would be absorbed by the gases en route.