International agreement to limit CFC production ; stratospheric ozone. Note: This May 2017 version of the Guidelines includes revisions made to the Air District's 2010.Two main sources of PFCs are primary aluminum production and semiconductor manufacturing. Global Warming Potentials range from 6,500 to 9,200. International agreement to limit production and consumption of chlorofluorocarbons. (CFCs) and other ozone- destroying chemicals. On the international stage, the. And reported production. Shown are emissions of CFC-11 derived from AGAGE. Need international agreements restrict ing emissions. 1. 9. 8. 5. 9.