Assertion: acid rain | /r/HasProperty | serious problem
Facets:
value: to the environment
type: TRANSITIVE-OBJECT
value: always
type: DEGREE
Source sentences:
text: Acid rain was always a serious problem.
text: Acid rain is a serious issue and increasing its level day by day, so it needs a huge attention globally.
text: Acid rain is a serious threat to the environment.
text: Acid rain or acid deposition is a serious problem affecting fish and fisheries in many parts of the western world.