Challenges in Estimating Global CF4 and C2F6 Emissions

CF4 and C2F6 are very long-lived greenhouse gases (GHG) 50,000 and 10,000 years respectively with a global warming potential (GWP100) of 7390 and 9200. These two perfluorocarbons (PFCs) are almost entirely anthropogenic. Three main sources have been identified: (a) Aluminium Industry (AI), (b) Semiconductor Industry (SCI) and (c) Rare Earth Smelting (RES). Estimating global emissions over time and compiling a bottom-up inventory, are both challenging tasks as there are several limitations related to them. Identifying and addressing those challenges in order to produce an updated and inclusive bottom-up inventory could result in a better understanding of previous CF4 and C2F6 emissions and improved future estimates of these potent greenhouse gasses.