A CO2 footprint is an inventory of the total amount of emitted greenhouse gases, expressed in CO2 equivalents. CO2 emissions are caused by the combustion of fuels. Too much CO2 in the atmosphere leads to climate change. A CO2 footprint indicates the extent to which an organisation impacts climate change and where CO2 emissions can be reduced. A CO2 footprint is categorised in Scope 1, 2 and 3. Scope 1 involves direct CO2 emissions; scope 2 indirect CO2 emissions via the acquisition of electricity and gas; and scope 3 involves all other indirect CO2 emissions. Annex 1 (Corporate Social Responsibility) and Annex 3 (About this report) provide more information on our CO2 footprint.