Assertion: detector's source | /r/HasProperty | natural
Facets:
value: due to photochemical reactions in the troposphere
type: CAUSE
value: in origin
type: OTHER
value: worldwide
type: LOCATION
Source sentences:
text: Worldwide, the largest source of carbon monoxide is natural in origin, due to photochemical reactions in the troposphere that generate about 5*10^12 kilograms per year.