( ( ( Introduction ( Despite ( ( the ( apparent abundance ) ) ( of water ) ) ) ) ( on earth ) ) ( , ( ( fresh water ) ( ( is ( relatively scarce ) ) . ) ) ) )
(ROOT (S (S (ADJP (JJ Introduction)) (PP (IN Despite) (NP (NP (DT the) (JJ apparent) (NN abundance)) (PP (IN of) (NP (NN water))))) (PP (IN on) (NP (NN earth)))) (, ,) (NP (JJ fresh) (NN water)) (VP (VBZ is) (ADJP (RB relatively) (JJ scarce))) (. .)))
Introduction Despite the apparent abundance of water on earth, fresh water is relatively scarce.
(ROOT (S (NP (NP (DT The) (NN abundance)) (PP (IN of) (NP (NN water)))) (VP (VBZ makes) (NP (NP (DT the) (NN earth) (NN habitable)) (PP (IN for) (NP (NNS humans))))) (. .)))