PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • For natural gas the problem lies in potential impacts of fracking (water contamination, air pollution and even earthquakes) on local communities including high-population areas in the eastern U.S. For oil, it???s the ongoing environmental issues including disasters like the Gulf oil spill, as well as price spikes and supply bottlenecks that attend the global marketplace.
http://www.w3.org/ns/prov#wasQuotedFrom
  • cleantechnica.com