About: http://webisa.webdatacommons.org/46905671

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	But there are a lot of places nowadays where CO2 and other trace gases are measured, see:
http://www.w3.org/ns/prov#wasQuotedFrom	wattsupwiththat.com