Assertion: acid rain | /r/CapableOf | become in 1980
Facets:
Source sentences:
text: Acid rain became a political issue in the 1980s, when Canada claimed that pollutants from the United States were contaminating its forests and waters.
text: Acid rain” became a household term in the 1980s when unchecked emissions from industry and motor vehicles were blamed for causing environmental deterioration.