1. Global Temperature in 2020. Available:https://mailchi.mp/caa/global-temperature-in-2020?e=670df34344[22 April 2021].
2. Global surface temperature change;Hansen J;Rev Geophys,2010
3. The environmental impact of CFC replacements – HFCs and HCFCs;Wallington TJ;Environ Sci Technol,1994
4. About Montreal Protocol. Available:https://www.unenvironment.org/ozonaction/who-we-are/about-montreal-protocol[21 September 2020].
5. Foam Extrusion of Polystyrene Blown with HFC-134a