( Drought ( ( intensifies ( through ( positive feedback ) ) ) . ) )
(ROOT (S (NP (NNP Drought)) (VP (VBZ intensifies) (PP (IN through) (NP (JJ positive) (NN feedback)))) (. .)))
Drought intensifies through positive feedback.
(ROOT (S (NP (JJ Positive) (NN feedback)) (VP (VP (VBZ intensifies) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NP (DT the) (NN body) (POS 's)) (JJ physiological) (NN condition))))) (CONJP (RB rather) (IN than)) (VP (VBG reversing) (NP (PRP it)))) (. .)))