( ( ( ( fossil fuels ) , ) ( solar ( and ( nuclear energy ) ) ) ) . )
(ROOT (NP (NP (JJ fossil) (NNS fuels)) (, ,) (NP (JJ solar) (CC and) (JJ nuclear) (NN energy)) (. .)))
fossil fuels, solar and nuclear energy.
(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))))) (. .)))