( ( ( The accumulation ) ( of ( ( greenhouse gases ) ( in ( ( the atmosphere ) ( due ( to ( human activities ) ) ) ) ) ) ) ) ( ( will ( ( change ( the climate ) ) ( by ( ( ( enhancing ( the ( natural ( greenhouse effect ) ) ) ) , ) ( leading ( to ( ( an increase ) ( in ( ( the ( Earth 's ) ) temperature ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN accumulation)) (PP (IN of) (NP (NP (NN greenhouse) (NNS gases)) (PP (IN in) (NP (NP (DT the) (NN atmosphere)) (ADJP (JJ due) (PP (TO to) (NP (JJ human) (NNS activities))))))))) (VP (MD will) (VP (VB change) (NP (DT the) (NN climate)) (PP (IN by) (S (VP (VP (VBG enhancing) (NP (DT the) (JJ natural) (NN greenhouse) (NN effect))) (, ,) (VP (VBG leading) (PP (TO to) (NP (NP (DT an) (NN increase)) (PP (IN in) (NP (NP (DT the) (NN Earth) (POS 's)) (NN temperature))))))))))) (. .)))
The accumulation of greenhouse gases in the atmosphere due to human activities will change the climate by enhancing the natural greenhouse effect, leading to an increase in the Earth's temperature.
(ROOT (S (NP (NNP Human) (NNS actions)) (VP (VBZ has) (VP (VBN increased) (NP (DT the) (NN greenhouse) (NN effect)))) (. .)))