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Greenhouse gases (GHGs) are gaseous substances able to trap heat in the atmosphere. The “enhanced” greenhouse effect, which is responsible for climate change, is caused by human activities emitting GHGs in the atmosphere such as: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulphur hexafluoride (SF6). Please note that water vapour, although the largest contributor to the natural greenhouse effect, is not directly affected by human activity and is not included. (source: based on Kyoto Protocol website)