Assertion: caribou's number | /r/HasAspect | negative impact
Facets:
value: on their ranges
type: LOCATION
value: through overgrazing
type: MANNER
Source sentences:
text: If the large number of caribou in the late 1990s and 2000s had a negative impact on their ranges through overgrazing, caribou may be searching for new areas, increasing the degree of mixing between herds.