About Greenhouse Gases

It isn't just CO₂ that is classed a green house gas - there are others, each with different potency. Although CO₂ has the lowest global warming potential (GWP), the enormous volume produced means that it accounts for over 80% of the UK's output.

Carbon Dioxide - 1
Methane - 21
Hydrofluorocarbons - 140 to 11700
Nitrous Oxide - 310 (used in squirty aerosol cream)
Perfluorocarbons - 6500 to 9200
Sulphur hexafluoride - 22,200-23,900

Reference: www.environment-agency.gov.uk