( ( b -RRB- ) ( ( melt ( ( the ( polar caps ) ) ( to ( ( increase ( ( the amount ) ( of ( liquid water ) ) ) ) ( on ( the planet ) ) ) ) ) ) . ) )
(ROOT (S (LST (LS b) (-RRB- -RRB-)) (VP (VB melt) (S (NP (DT the) (JJ polar) (NNS caps)) (VP (TO to) (VP (VB increase) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (JJ liquid) (NN water)))) (PP (IN on) (NP (DT the) (NN planet))))))) (. .)))
b) melt the polar caps to increase the amount of liquid water on the planet.
(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.