A scientific paper on HCFCs and HFCs emissions has compared global emissions calculated from atmospheric measurements with HFC emissions reported
annually by UNFCCC Annex 1 Parties
(developed countries and those with economies in transition).
The results show that “unreported emissions” have increased rapidly over time and, by 2012, accounted for nearly 50% of global HFC emission.
In particular, HFC-134a reported emissions from Annex 1 Parties have been stabilizing since 2007, while global emissions are increasing (figure).
According to the authors, these discrepancies suggest that HFC emissions from developing countries (non-Annex I Parties, which don’t report emissions to the UNFCCC) have increased rapidly over time and, by 2012, accounted for nearly 50% of global HFC emissions.
Source : Recent Trends in Global Emissions of Hydrochlorofluorocarbons and Hydrofluorocarbons: Reflecting on the 2007 Adjustments to the Montreal Protocol