14 Life Cycle Assessment www.thg.eco www.mycarbon.co.uk adam.lowe3@thehutgroup.com info@mycarbon.co.uk Table 4: Summary of uncertainty analysis Category Uncertainty Factor Uncertainty Statement Risk (%) Parameter Uncertainty Direct emissions data No direct emissions data collected 0 Parameter Uncertainty Activity data Conservative estimates used where primary activity data could not be collected. Bill of materials, process routing, waste streams and distribution streams are all precise. Primary uncertainty arises from the acquisition and pre-production of raw materials, with limited information on these processes. 5 Parameter Uncertainty Emissions factor data High quality emissions factors have a high level of uncertainty balanced in the positive and negative directions. This assessment will not include any additional risk for the use of emissions factors. 0 Parameter Uncertainty Global warming potential (GWP) factors Primary source of GWP data included in emissions factors is from DEFRA. DEFRA includes all key GHG factors, but this is a broad industry average and therefore carries uncertainty that is equal and opposite in the uncertainty distribution. 0 Scenario Uncertainty Methodological Choice No uncertainty assigned. 0 Model Uncertainty Model limitations Standard carbon footprinting process of primary data multiplied by industry average emissions factors used. 0 Summary Overall risk applied to the total carbon footprint to account for the above uncertainty categories is 5% for the entire footprint. 5
RkJQdWJsaXNoZXIy MTY2MTQwOA==