Assertion: cigarette butt's filter | /r/CapableOf | collect in sewage
Facets:
Source sentences:
text: Cigarette filters are made from cellulose acetate, a plastic which, though technically biodegradable, only degrades under severe biological circumstances, such as when filters collect in sewage.
text: The plastic, cellulose acetate, only degrades under severe biological circumstances, such as when filters collect in sewage.