Rise in banned chemical use hurting ozone

The video discusses research published in Nature, highlighting findings that suggest CFC 11, an ozone-depleting chemical, is being produced in East Asia. Historically used in the 1930s as a refrigerant and in aerosols, its continued production may hinder ozone recovery. Researchers attribute this to unreported new production.

How might the continued production of CFC 11 affect the recovery of the ozone layer?

What conclusion did researchers reach regarding the presence of CFC 11?