The accounting and footprint calculations were done with the support of an external consultant, the Swissbased Sulytics company. The data inventory was based on data provided by Gurit. Data was collected by each site and entered directly into the Sulytics Tool, for which they received training. Data from the global procurement and human resources departments was centrally uploaded to the tool. The data itself underwent internal plausibility checks and advisory from a qualified external expert, however it has not been audited or verified by a third party. If no primary data was available, secondary data was considered, such as industry or national averages, expenditure, extrapolations based on information from other sites, or data from the GHG accounting of the previous year. Where inventory data was lacking, extrapolations and estimations were made by either Sulytics or Gurit experts such as the Head of Product Development, Product Managers, Site Managers or the Head of Operations of the production site concerned. This was undertaken according to their best knowledge, but such estimates cannot completely compensate for the absence of true data. Therefore, future variances in year-onyear data may or may not reflect an improvement of data quality, rather than a change in performance.

The emission factors for the different categories are based on renowned databases such as: Ecoinvent, the world’s leading lifecyle inventory (LCI) database; the Department for Business, Energy & Industrial Strategy (BEIS) UK; the United States Environmental Protection Agency; and the International Energy Agency. Overall, the data inventory, emission factors and assumptions are in line with the GHG Protocol. The choice of assumptions and emission factors follow a conservative approach. Unless otherwise specified, all emission values in the greenhouse gas report are given in metric tons of carbon dioxide equivalent (tCO2e). We have therefore not only included CO2, but also the other greenhouse gases mentioned in the Kyoto Protocol, e.g., methane (CH4) and nitrous oxide (N2O). Global Warming Potential (GWP) is a measure of the climate impact of a GHG compared to carbon dioxide over a time period, and is necessary in order to apply one unit to all the different GHG. GHG emissions have different GWP values depending on their efficiency to absorb longwave radiation and the atmospheric lifetime of the gas. The GWP values used in GHG accounting considers the six GHGs covered by the United Nations Framework Convention on Climate Change (UNFCCC) and Kyoto Protocol. These are the GWP used by BEIS and are based on the ‘Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4)’.