About: http://webisa.webdatacommons.org/223737196

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	Methane emissions from natural sources such as wetlands and marshes constitutes 30 percent of the methane, perhaps another 13 million tons annually in the U.S. Worldwide emissions of methane are at least ten times as large.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com