We calculate our emissions using the globally recognised WRI/WBCSD Greenhouse Gas Protocol Corporate Accounting and Reporting Standard (GHG Protocol) for the six GHGs covered by the Kyoto Protocol: carbon dioxide (COmethane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulphur hexafluoride (SF6).