PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In fact, the answer is not known with a high degree of certainty, not only because of the lack-of-equlibrium problem (which involves uptake of heat by the ocean), but also because of additional complexities arising from air pollution, trace gases other than carbon dioxide, possible changes in the brightness of the Sun, and effects from volcanic activity.
http://www.w3.org/ns/prov#wasQuotedFrom
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