About: http://webisa.webdatacommons.org/414868221

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	I agree with you that natural gas is a bridge and I would add that coal is part of that equation as well.
http://www.w3.org/ns/prov#wasQuotedFrom	wsj.com