PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Here, I merely point to a paper in Science by Nisbet which argues specifically that the cold Younger Dryas was ended due to methane emissions which came mostly from wetlands, but for which the initial trigger could have been Arctic methane clathrates:
http://www.w3.org/ns/prov#wasQuotedFrom
  • blogspot.com