( ( For another ) ( , ( it ( ( ( ( is ( ( ( ( not practical ) , ) nor ) ( even ethical ) ) ) , ) ( to ( experiment ( with ( ( human populations ) ( in ( an ( attempt ( to ( ( determine ( limits ( and ( carrying capacities ) ) ) ) ( for ( humans ( in ( specific environments ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (DT another))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADJP (ADJP (RB not) (JJ practical)) (, ,) (CC nor) (ADJP (RB even) (JJ ethical))) (, ,) (PP (TO to) (NP (NP (NN experiment)) (PP (IN with) (NP (NP (JJ human) (NNS populations)) (PP (IN in) (NP (DT an) (NN attempt) (S (VP (TO to) (VP (VB determine) (NP (NNS limits) (CC and) (NN carrying) (NNS capacities)) (PP (IN for) (NP (NP (NNS humans)) (PP (IN in) (NP (JJ specific) (NNS environments))))))))))))))) (. .)))
For another, it is not practical, nor even ethical, to experiment with human populations in an attempt to determine limits and carrying capacities for humans in specific environments.
(ROOT (S (NP (NNS Humans)) (VP (VBP are) (ADJP (JJ unique) (PP (IN in) (NP (PRP$ their) (NN ability) (S (VP (TO to) (VP (VB alter) (NP (PRP$ their) (NN environment)) (PP (IN with) (NP (NP (DT the) (JJ conscious) (NN purpose)) (PP (IN of) (NP (NP (JJ increasing) (VBG carrying) (NN capacity)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ acts) (PP (IN as) (NP (NP (DT a) (JJ limiting) (NN factor)) (PP (IN on) (NP (NP (NNS populations)) (PP (IN in) (NP (NN general))))))))))))))))))))) (. .)))