( We ( ( would ( substitute ( ( renewable ( energy sources ) ) ( such ( as ( ( solar ( , ( hydroelectric ( , ( biomass ( , ( wind ( , ( OTEC ( , ( and hydrogen ) ) ) ) ) ) ) ) ) ) ) ( for ( fossil fuels ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD would) (VP (VB substitute) (NP (NP (JJ renewable) (NN energy) (NNS sources)) (PP (JJ such) (IN as) (NP (NP (CD solar) (, ,) (NN hydroelectric) (, ,) (NN biomass) (, ,) (NN wind) (, ,) (NN OTEC) (, ,) (CC and) (NN hydrogen)) (PP (IN for) (NP (JJ fossil) (NNS fuels)))))))) (. .)))
We would substitute renewable energy sources such as solar, hydroelectric, biomass, wind, OTEC, and hydrogen for fossil fuels.
(ROOT (S (NP (NP (NNP Solar)) (CC and) (NP (NN wind))) (VP (VBP are) (ADVP (RB still)) (ADJP (JJ expensive)) (PP (VBN compared) (PP (TO to) (NP (JJ fossil) (NNS fuels))))) (. .)))