( ( The ( Energy Program ) ) ( ( is ( ( performing ( innovative research ) ) ( to ( ( ( document ( ( the ( natural emission ) ) ( of ( methane gas ) ) ) ) ( from ( ( the ( Earth 's ) ) crust ) ) ) ( to ( the atmosphere ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Energy) (NN Program)) (VP (VBZ is) (VP (VBG performing) (NP (JJ innovative) (NN research)) (S (VP (TO to) (VP (VB document) (NP (NP (DT the) (JJ natural) (NN emission)) (PP (IN of) (NP (NN methane) (NN gas)))) (PP (IN from) (NP (NP (DT the) (NN Earth) (POS 's)) (NN crust))) (PP (TO to) (NP (DT the) (NN atmosphere)))))))) (. .)))
The Energy Program is performing innovative research to document the natural emission of methane gas from the Earth's crust to the 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)))))))) (. .)))