Assertion: atlantic salmon's river | /r/CapableOf | become polluted
Facets:
value: increasingly
type: DEGREE
Source sentences:
text: However, with the onset of the industrial revolution, many rivers became polluted or were blocked by dams, and salmon populations declined or disappeared.
text: But the species quickly died off after a series of dams blocked the fish's migration routes and as the river became increasingly polluted.