Explanation:

 Earth's atmosphere generally permits the free passage of sunlight in the visible band of the spectrum. Most of this light reaches the surface, whether oceanic or continental, and is absorbed. There is an upper limit to the energy that can be stored in the Earth's crust this way, however, and once the saturation point is reached, Earth begins to radiate energy back into space.

Some of this terrestrial radiation is intercepted by atmospheric gases. Apart from nitrogen and oxygen, virtually all the common gases in the atmosphere absorb some terrestrial radiation. This trapped energy is kept as heat that drives the global climate system.