( ( ( The energy ) ( of ( ( electromagnetic radiation ) ( from ( ( the sun ) ( reaching ( ( the ( earth 's ) ) surface ) ) ) ) ) ) ) ( ( ( is ( in equilibrium ) ) ( with ( ( the energy ) ( ( ( radiated thermally ) ( back ( into space ) ) ) ( -LRB- ( ( in ( ( the form ) ( of ( infrared radiation ) ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN energy)) (PP (IN of) (NP (NP (JJ electromagnetic) (NN radiation)) (PP (IN from) (NP (NP (DT the) (NN sun)) (VP (VBG reaching) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface)))))))) (VP (VBZ is) (PP (IN in) (NP (NN equilibrium))) (SBAR (IN with) (S (NP (DT the) (NN energy)) (VP (VBD radiated) (ADVP (RB thermally)) (PP (ADVP (RB back)) (IN into) (NP (NN space))) (PRN (-LRB- -LRB-) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (JJ infrared) (NN radiation))))) (-RRB- -RRB-)))))) (. .)))
The energy of electromagnetic radiation from the sun reaching the earth's surface is in equilibrium with the energy radiated thermally back into space (in the form of infrared radiation).
(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)))))))) (. .)))