Assertion: methane's concentration | /r/CapableOf | increase by 40%
Facets:
value: to levels
type: OTHER
value: respectively
type: MANNER
value: during the last 250 years
type: TEMPORAL
Source sentences:
text: During the last 250 years, atmospheric concentrations of CO 2 , CH 4 , N 2 O, increased by 40%, 150%, and 20%, respectively, to levels which are unprecedented within the past 800,000 years.