( ( ( Renewable ( Solar ( Hydropower ( Tidal energy ) ) ) ) ( ( Geothermal ( energy ( Wind energy ) ) ) 2 ) ) . )
(ROOT (NP (NP (NNP Renewable) (NNP Solar) (NNP Hydropower) (NNP Tidal) (NN energy)) (NP (NP (NNP Geothermal) (NN energy) (NN Wind) (NN energy)) (NP (CD 2))) (. .)))
Renewable Solar Hydropower Tidal energy Geothermal energy Wind energy 2.
(ROOT (S (NP (NNP Hydropower)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (RB widely) (VBN used)) (NN form)) (PP (IN of) (NP (NP (JJ renewable) (NN energy)) (PP (IN in) (NP (DT the) (NN world))))))) (. .)))