Definition

Gases which cause the greenhouse effect, such as carbon dioxide, methane, and water vapour.

Further reading
What Are Greenhouse Gases and Why Do They Matter - NOAA Climate.gov [website]
Overview of Greenhouse Gases - Environmental Protection Agency (EPA) [website]
Related

carbon accounting; carbon budget; carbon cycle; chlorofluorocarbons (CFCs); fluorinated gases; greenhouse gas emissions; greenhouse gas monitoring; hydrofluorocarbons (HFCs); infrared active; Keeling Curve; Kyoto Protocol; methane (CH4); nitrogen trifluoride (NF3); nitrous oxide (N2O); ozone (O3); perfluorocarbons, sulfur hexafluoride; sulphur hexafluoride (SF6); water vapor

See also
Anthropogenic
Carbon dioxide equivalent (CO2e)
Carbon footprint
Climate change
Climate sensitivity
Global Warming Potential (GWP)
Greenhouse effect
Drafted by
Chris Graham
Reviewed by
TBC