PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Natural gas is primarily methane, and when methane is leaked into the atmosphere, it is a more potent greenhouse gas than carbon dioxide by a factor of 30 to hundreds, depending on the time period over which it is emitted and other factors.
http://www.w3.org/ns/prov#wasQuotedFrom
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