( ( ( ( ( ( Some ( of ( this ( re-radiated energy ) ) ) ) ( escapes ( to space ) ) ) , ) but ) ( ( much ( of ( this ( re-radiated energy ) ) ) ) ( is ( ( ( reflected back ) ( to ( ( the ( earth 's ) ) surface ) ) ) ( by ( molecules ( in ( ( the ( earth 's ) ) atmosphere ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT Some)) (PP (IN of) (NP (DT this) (JJ re-radiated) (NN energy)))) (VP (VBZ escapes) (PP (TO to) (NP (NN space))))) (, ,) (CC but) (S (NP (NP (RB much)) (PP (IN of) (NP (DT this) (JJ re-radiated) (NN energy)))) (VP (VBZ is) (VP (VBN reflected) (PRT (RP back)) (PP (TO to) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))) (PP (IN by) (NP (NP (NNS molecules)) (PP (IN in) (NP (NP (DT the) (NN earth) (POS 's)) (NN atmosphere)))))))) (. .)))
Some of this re-radiated energy escapes to space, but much of this re-radiated energy is reflected back to the earth's surface by molecules in the earth's atmosphere.
(ROOT (S (NP (NP (NNS Gases)) (PP (JJ such) (IN as) (NP (NN co2) (CC and) (NN methane)))) (VP (MD can) (VP (NN trap) (NP (NP (JJ thermal) (NN energy)) (PP (IN in) (NP (NP (NN earth) (POS 's)) (NN atmosphere)))) (PP (IN before) (S (VP (VBG radiating) (NP (PRP it)) (PP (IN into) (NP (NN space)))))))) (. .)))