( ( As ( ( this energy ) ( ( radiates back ) ( toward ( space ( as heat ) ) ) ) ) ) ( , ( ( a portion ) ( ( is ( ( absorbed ( by ( ( a ( delicate balance ) ) ( of ( heat-trapping gases ) ) ) ) ) ( in ( ( the atmosphere ) ( among ( ( ( them ( carbon ( ( dioxide and ) methane ) ) ) -- ) ( which ( creates ( an ( insulating layer ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT this) (NN energy)) (VP (VBZ radiates) (PRT (RP back)) (PP (IN toward) (NP (NP (NN space)) (PP (IN as) (NP (NN heat)))))))) (, ,) (NP (DT a) (NN portion)) (VP (VBZ is) (VP (VBN absorbed) (PP (IN by) (NP (NP (DT a) (JJ delicate) (NN balance)) (PP (IN of) (NP (JJ heat-trapping) (NNS gases))))) (PP (IN in) (NP (NP (DT the) (NN atmosphere)) (PP (IN among) (NP (NP (NP (PRP them)) (NP (NN carbon) (NN dioxide) (CC and) (NN methane))) (: --) (SBAR (WHNP (WDT which)) (S (VP (VBZ creates) (NP (DT an) (JJ insulating) (NN layer))))))))))) (. .)))
As this energy radiates back toward space as heat, a portion is absorbed by a delicate balance of heat-trapping gases in the atmosphere among them carbon dioxide and methane -- which creates an insulating layer.
(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)))))))) (. .)))