Definition

The trapping of heat in the Earth’s atmosphere by greenhouse gases, through the absorption of infrared radiation.

Further reading
What is the greenhouse effect? - National Aeronautics and Space Administration (NASA) [website]
Greenhouse Effect - National Geographic [website]
Related

Earth's Energy Imbalance (EEI); enhanced greenhouse effect; Keeling Curve; natural greenhouse effect; radiative balance; radiative forcing; runaway greenhouse effect

See also
Climate change
Global Warming Potential (GWP)
Greenhouse Gases (GHGs)
Drafted by
Chris Graham
Reviewed by
TBC