( ( ( Solar and ) ( wind energy ) ) ( ( remain ( too ( expensive ( to ( ( compete ( with ( fossil fuel ) ) ) ( despite ( billions ( in R&D ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Solar)) (CC and) (NP (NN wind) (NN energy))) (VP (VBP remain) (ADJP (RB too) (JJ expensive) (S (VP (TO to) (VP (VB compete) (PP (IN with) (NP (JJ fossil) (NN fuel))) (PP (IN despite) (NP (NP (NNS billions)) (PP (IN in) (NP (NNP R&D)))))))))) (. .)))
Solar and wind energy remain too expensive to compete with fossil fuel despite billions in R&D.
(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))))) (. .)))