( they ( ( run ( on ( ( ( ( ( ( wind , ) sunlight ) , ) ( ocean waves ) ) and ) ( organic gas ) ) ) ) . ) )
(ROOT (S (NP (PRP they)) (VP (VBP run) (PP (IN on) (NP (NP (NN wind)) (, ,) (NP (NN sunlight)) (, ,) (NP (NN ocean) (NNS waves)) (CC and) (NP (JJ organic) (NN gas))))) (. .)))
they run on wind, sunlight, ocean waves and organic gas.
(ROOT (S (NP (NNP Ocean) (NNS waves)) (VP (VBP are) (ADVP (RB mainly)) (VP (VBN caused) (PP (IN by) (NP (NN wind))))) (. .)))