( Also ( ( crowd ( ( scenes or ) ( other ( overpopulation ideas ) ) ) ) . ) )
(ROOT (SINV (RB Also) (VP (VBP crowd)) (NP (NP (NNS scenes)) (CC or) (NP (JJ other) (NN overpopulation) (NNS ideas))) (. .)))
Also crowd scenes or other overpopulation ideas.
(ROOT (S (NP (NNP Human) (NNP overpopulation)) (VP (VBZ is) (VP (VP (VBG crowding) (PRT (RP out)) (NP (JJ other) (NNS species))) (CC and) (VP (VBG making) (S (NP (NP (PDT all) (DT the) (JJ other) (NNS causes)) (PP (IN of) (NP (NN extinction)))) (ADJP (RBR worse)))))) (. .)))