( ( Population growth ) ( ( outstripped ( ( the ( carrying capacity ) ) ( of ( the land ) ) ) ) . ) )
(ROOT (S (NP (NNP Population) (NN growth)) (VP (VBD outstripped) (NP (NP (DT the) (VBG carrying) (NN capacity)) (PP (IN of) (NP (DT the) (NN land))))) (. .)))
Population growth outstripped the carrying capacity of the land.
(ROOT (S (NP (NNP Growth)) (VP (VBZ stops) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN population)) (VP (VBZ reaches) (NP (DT the) (VBG carrying) (NN capacity)))))) (. .)))
Growth stops when a population reaches the carrying capacity.