( ( ( value ( ( trees and ) water ) ) ( them ( during ( drought periods ) ) ) ) . )
(ROOT (NP (NP (NN value) (NNS trees) (CC and) (NN water)) (NP (NP (PRP them)) (PP (IN during) (NP (NN drought) (NNS periods)))) (. .)))
value trees and water them during drought periods.
(ROOT (S (SBAR (IN Because) (S (NP (NNS trees)) (VP (VBP add) (NP (NN water) (NN vapor)) (PP (TO to) (NP (NN air)))))) (, ,) (S (VP (VBG cutting) (PRT (RP down)) (NP (NNS forests)))) (VP (VBZ leads) (PP (TO to) (NP (NP (JJR longer) (NNS periods)) (PP (IN of) (NP (NN drought)))))) (. .)))