About: http://webisa.webdatacommons.org/249817331

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	Since carbon dioxide is a well-mixed gas in the air, the appropriate measure is the concentration, usually expressed in parts per million, ppm.
http://www.w3.org/ns/prov#wasQuotedFrom	realclimate.org