@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<http://astrothesaurus.org/uat/684>
  skos:prefLabel "Greenhouse gases"@en ;
  a skos:Concept ;
  skos:narrower <http://astrothesaurus.org/uat/227> .

<http://astrothesaurus.org/uat/227>
  skos:broader <http://astrothesaurus.org/uat/684> ;
  skos:prefLabel "Chlorofluorocarbons"@en ;
  a skos:Concept .