( ( ( ( enhanced ( greenhouse effect ) ) ( the increase ) ) ( in ( ( the strength ) ( of ( the ( natural ( greenhouse effect ) ) ) ) ) ) ) ( , ( ( resulting ( from ( ( human activities ) ( that ( ( release ( ( additional quantities ) ( of ( greenhouse gases ) ) ) ) ( into ( the atmosphere ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NP (JJ enhanced) (NN greenhouse) (NN effect)) (NP (DT the) (NN increase))) (PP (IN in) (NP (NP (DT the) (NN strength)) (PP (IN of) (NP (DT the) (JJ natural) (NN greenhouse) (NN effect)))))) (, ,) (VP (VBG resulting) (PP (IN from) (NP (NP (JJ human) (NNS activities)) (SBAR (WHNP (WDT that)) (S (VP (VBP release) (NP (NP (JJ additional) (NNS quantities)) (PP (IN of) (NP (NN greenhouse) (NNS gases)))) (PP (IN into) (NP (DT the) (NN atmosphere))))))))) (. .)))
enhanced greenhouse effect the increase in the strength of the natural greenhouse effect , resulting from human activities that release additional quantities of greenhouse gases into the atmosphere.
(ROOT (S (NP (NNP Human) (NNS actions)) (VP (VBZ has) (VP (VBN increased) (NP (DT the) (NN greenhouse) (NN effect)))) (. .)))