( Coal ( ( is ( a ( tantalizing ( energy ( source option ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (DT a) (JJ tantalizing) (NN energy) (NN source) (NN option))) (. .)))
Coal is a tantalizing energy source option.
(ROOT (S (S (NP (NNP Coal)) (VP (VBZ is) (ADJP (JJ nonrenewable)))) (, ,) (CC and) (S (NP (DT the) (NN sun)) (VP (VBZ is) (ADJP (JJ renewable) (SBAR (S (VP (VBZ is) (SBAR (WHADVP (WRB how)) (S (NP (NP (NN coal)) (CC and) (NP (DT the) (NN sun))) (VP (VBP compare) (PP (IN as) (NP (NP (NNS sources)) (PP (IN of) (NP (NN energy)))))))))))))) (. .)))