( ( Greenhouse gases ) ( ( ( trap ( heat ( inside ( ( ( ( the ( earth 's ) ) atmosphere ) , ) ( ( so ( causing temperatures ) ) ( to ( increase ( and ( sea levels ) ) ) ) ) ) ) ) ) ( to ( rise ( as ( ( the ( polar ( ice caps ) ) ) melt ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Greenhouse) (NNS gases)) (VP (NN trap) (NP (NP (NN heat)) (PP (IN inside) (NP (NP (NP (DT the) (NN earth) (POS 's)) (NN atmosphere)) (, ,) (ADVP (RB so) (NP (CD causing) (NNS temperatures)) (PP (TO to) (NP (NN increase) (CC and) (NN sea) (NNS levels))))))) (S (VP (TO to) (VP (VB rise) (SBAR (IN as) (S (NP (DT the) (JJ polar) (NN ice) (NNS caps)) (VP (VB melt)))))))) (. .)))
Greenhouse gases trap heat inside the earth's atmosphere, so causing temperatures to increase and sea levels to rise as the polar ice caps melt.
(ROOT (S (NP (JJS Most) (NNS scientists)) (VP (VBP agree) (SBAR (IN that) (S (NP (NP (DT an) (NN increase)) (PP (IN in) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN greenhouse) (NNS gases)) (VP (VBG entering) (NP (NP (NN earth) (POS 's)) (NN atmosphere)))))))) (VP (VBZ causes) (NP (NP (DT an) (NN increase)) (PP (IN in) (NP (NP (NN melting)) (PP (IN of) (NP (JJ polar) (NN ice) (NNS caps)))))))))) (. .)))
Most scientists agree that an increase in the amount of greenhouse gases entering earth's atmosphere causes an increase in melting of polar ice caps.