@prefix skos: . @prefix isothes: . skos:prefLabel "sewage treatment"@en ; a skos:Concept ; skos:broader . skos:definition "The history of civilization, especially urban civilization, is the history of water—of the fundamental need to supply clean, fresh, disease-free drinking water while simultaneously disposing of vast quantities of disease-ridden, foul human and animal waste. From at least the time of the Phoenicians up to the present day, the growth of the world's major metropolitan centers—Rome, Paris, London, New York, Beijing—has been defined by how well they solved that dilemma of water supply and waste disposal. [Source: Encyclopedia of Social Problems; Environment, Sewage Disposal]"@en ; skos:narrower ; skos:broader , ; skos:prefLabel "sewage disposal"@en ; a skos:Concept . a skos:Collection, isothes:ConceptGroup ; skos:prefLabel "concepts"@en ; skos:member . skos:prefLabel "population and environment"@en ; a skos:Concept ; skos:narrower . skos:prefLabel "waste disposal"@en ; a skos:Concept ; skos:narrower .