PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Natural gas will ??? in time ??? face many of the same risks as coal: price increases and volatility as the easily recoverable resources are depleted, more stringent environmental regulations that will demand capital investments, and competition from wind, solar, and other forms of renewable energy.
http://www.w3.org/ns/prov#wasQuotedFrom
  • desmogblog.com