PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Carbon dioxide is the most important gas, its emissions originate primarily from fuel combustion and forest clearing.[Table 2] Methane has also an important contribution to national emissions of greenhouse gases, and it originates primarily from oil and gas production and agricultural activities.
http://www.w3.org/ns/prov#wasQuotedFrom
  • gcrio.org