About: http://webisa.webdatacommons.org/392959616

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	Because actual measurement of temperatures with thermometers only started in 1850, all temperature data for prior years have to be estimated by proxies such as a lake sediments, ice cores, boreholes, and tree rings.
http://www.w3.org/ns/prov#wasQuotedFrom	dogbrothers.com