Assertion: acid rain's cause | /r/HasProperty | motor vehicles
Facets:
value: from human sources
type: OTHER
Source sentences:
text: The principal cause of acid rain is sulfur and nitrogen compounds from human sources, such as electricity generation, animal agriculture, factories, and motor vehicles.
text: The principal cause of acid rain is sulfur and nitrogen compounds from human sources, such as electricity generation, animal agriculture, factories, and motor vehicles.