About: http://webisa.webdatacommons.org/228142917

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Unconventional oil sources such as shale or tar sands may be abundant, but they have much higher production costs than conventional light crude.
http://www.w3.org/ns/prov#wasQuotedFrom	portnews.com.au