Green House Gases

There are some GHGs that are present in the atmosphere due to both natural processes and human activities. These include:

• Water vapour (H₂O)
• Carbon dioxide (CO₂)
• Methane (CH₄)
• Nitrous oxide (N₂O)
• Tropospheric ozone (O₃)

There are also some GHGs that are almost entirely due to anthropogenic sources. These include:

• Chlorofluorocarbons (CFC)
• Hydrofluorocarbons (HFC)
• Perfluorocarbons (PFC)
• Sulfur hexafluoride (SF₆)