The phenomenon in which the Earth's atmosphere traps a certain amount of radiation received from the Sun is called the "Greenhouse effect". This effect is responsible for regulating Earth's characteristic temperature which is suitable enough presently to sustain it's complex Biological ecology and the geological processes. The heat trapped is ubiquitously distributed to the areas where no direct heat from the Sun can reach and rendering it hospitable. If it wasn't for the Greenhouse effect Earth's global temperature would be a lot more cooler than it is presently. Some greenhouse effect is essential for Earth to retain it's characteristic supporting properties for life.
