What causes terrestrial radiation?

Terrestrial radiation is primarily caused by the Earth's surface emitting heat in the form of infrared radiation. This process occurs as the Earth absorbs solar energy during the day and then re-radiates it at night. Additionally, terrestrial radiation is influenced by the presence of greenhouse gases in the atmosphere, which can trap some of this emitted heat, contributing to the greenhouse effect. This natural phenomenon helps regulate the Earth's temperature, but excessive greenhouse gases can lead to climate change.