What is an example of the greenhouse effect?
Night time cooling and cloud cover heat retention is an example of the greenhouse effect.
Night time cooling occurs as Earth releases or emits thermal radiation, or heat, in the form of "long wave radiation". This is essentially a release of heat.
Cloud cover heat retention occurs during cloudy nights. During a cloudy night, longwave radiation emitted by Earth is absorbed by clouds. A portion of the energy absorbed is re-emitted back to Earth, while the remainder is emitted into outer space.
Just like how cloud cover can act as a sort of blanket by retaining heat released by Earth, greenhouses gasses work in a similar fundamental manner but on a longer scale of time because unlike cloud cover, greenhouse gasses are always present in the atmosphere.