( ( Burning ( fossil fuel ) ) ( ( ( releases ( ( five pounds ) ( of ( carbon dioxide ) ) ) ) ( into ( ( the atmosphere ) ( for ( ( ( ( ( every ( seven pounds ) ) ( of ( fuel burned ) ) ) , ) and ) ( ( that ( CO2 ( traps heat ) ) ) ( that ( ( would otherwise ) ( be ( ( radiated back ) ( into space ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Burning) (NN fossil) (NN fuel)) (VP (VBZ releases) (NP (NP (CD five) (NNS pounds)) (PP (IN of) (NP (NN carbon) (NN dioxide)))) (PP (IN into) (NP (NP (DT the) (NN atmosphere)) (PP (IN for) (NP (NP (NP (DT every) (CD seven) (NNS pounds)) (PP (IN of) (NP (NP (NN fuel)) (VP (VBN burned))))) (, ,) (CC and) (NP (NP (DT that) (NNP CO2) (NNS traps) (NN heat)) (SBAR (WHNP (WDT that)) (S (VP (MD would) (ADVP (RB otherwise)) (VP (VB be) (VP (VBN radiated) (PRT (RP back)) (PP (IN into) (NP (NN space)))))))))))))) (. .)))
Burning fossil fuel releases five pounds of carbon dioxide into the atmosphere for every seven pounds of fuel burned, and that CO2 traps heat that would otherwise be radiated back into space.
(ROOT (S (NP (JJ Co2) (NN gas)) (VP (VBZ is) (VP (VBN released) (PP (IN into) (NP (NP (DT the) (NN atmosphere)) (SBAR (WHADVP (WRB when)) (S (NP (JJ fossil) (NNS fuels)) (VP (VBP are) (VP (VBN burned))))))))) (. .)))