( Otherwise ( , ( ( climate-sensitive ( phytoplankton productivity ) ) ( ( could ( ( become ( a ( positive-feedback factor ) ) ) ( in ( ( ( ( global ( climate change ) ) , ) ( rather than ) ) ( a ( potential ( negative-feedback countermeasure ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Otherwise)) (, ,) (NP (JJ climate-sensitive) (NN phytoplankton) (NN productivity)) (VP (MD could) (VP (VB become) (NP (DT a) (JJ positive-feedback) (NN factor)) (PP (IN in) (NP (NP (JJ global) (NN climate) (NN change)) (, ,) (CONJP (RB rather) (IN than)) (NP (DT a) (JJ potential) (JJ negative-feedback) (NN countermeasure)))))) (. .)))
Otherwise, climate-sensitive phytoplankton productivity    could become a positive-feedback factor in global climate change, rather than    a potential negative-feedback countermeasure.
(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)))) (. .)))