The production, transformation, and destruction of fluorinated gases results in emissions of fluorinated greenhouse gases, including PFCs. In the past, attention has been focused on emissions of HFC-23 from production of HCFC-22. However, information from the USEPA's Greenhouse Gas Reporting Program (GHGRP), as well as from other countries’ GHG Inventory Reporting under the UNFCCC, shows that emissions from production and transformation processes involving other compounds can also be significant. In this paper, we will review the sources and magnitudes of PFC emissions from fluorinated gas production, transformation, and destruction as reported to the GHGRP and internationally through GHG Inventories. We will also consider how PFC emissions are likely to have changed over time. Finally, we will discuss how the current default emission factor for fluorinated gas production in the 2006 IPCC Guidelines is likely to significantly underestimate uncontrolled fluorinated GHG emissions from this industry.