( ( The believers ) ( ( say ( that ( ( ( increased ( global temperature ) ) ( because ( of ( greenhouse gases ) ) ) ) ( will ( ( cause ( polar ( ice caps ) ) ) ( to melt ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS believers)) (VP (VBP say) (SBAR (IN that) (S (NP (NP (VBN increased) (JJ global) (NN temperature)) (PP (RB because) (IN of) (NP (NN greenhouse) (NNS gases)))) (VP (MD will) (VP (VB cause) (NP (JJ polar) (NN ice) (NNS caps)) (S (VP (TO to) (VP (VB melt))))))))) (. .)))
The believers say that increased global temperature because of greenhouse gases will cause polar ice caps to 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.