Assertion: chlorofluorocarbon | /r/HasProperty | main problem
Facets:
Source sentences:
text: CFC (A fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans) is also the main problem in which the ozone has become thinner.
text: Chlorofluorocarbons were developed in the 1930s and are now the main cause of ozone depletion.