( ( ( The sources ) discussed ) ( ( are ( ( ( ( ( sunlight ( , ( wind ( , ( geothermal ( and ( ocean ( thermal energy ) ) ) ) ) ) ) ) , ) ( tidal ( energy ( , ( coal ( , ( ( trash and ) garbage ) ) ) ) ) ) ) and ) chemicals ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS sources)) (VP (VBN discussed))) (VP (VBP are) (NP (NP (NN sunlight) (, ,) (NN wind) (, ,) (NN geothermal) (CC and) (NN ocean) (JJ thermal) (NN energy)) (, ,) (NP (JJ tidal) (NN energy) (, ,) (NN coal) (, ,) (NN trash) (CC and) (NN garbage)) (CC and) (NP (NNS chemicals)))) (. .)))
The sources discussed are sunlight, wind, geothermal and ocean thermal energy, tidal energy, coal, trash and garbage and chemicals.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN food) (POS 's)) (NN chemical) (NN energy)))) (ADVP (RB ultimately)) (VP (VBZ comes) (PP (IN from) (NP (NN sunlight)))) (. .)))