About: http://webisa.webdatacommons.org/274376158

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	Prior to the industrial revolution, there were no synthetic fertilizers, such as nitrogen, and crop yields were much lower than what they are today.
http://www.w3.org/ns/prov#wasQuotedFrom	humanprogress.org