( ( ( ( ( ( Renewable ( energy sources ) ) ( include ( solar ( , ( wind ( , ( landfill gas ) ) ) ) ) ) ) , ) and ) ( ( hydroelectric sources ) ( produce ( no ( net ( greenhouse gases ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Renewable) (NN energy) (NNS sources)) (VP (VBP include) (NP (JJ solar) (, ,) (NN wind) (, ,) (NN landfill) (NN gas)))) (, ,) (CC and) (S (NP (JJ hydroelectric) (NNS sources)) (VP (VBP produce) (NP (DT no) (JJ net) (NN greenhouse) (NNS gases)))) (. .)))
Renewable energy sources include solar, wind, landfill gas, and hydroelectric sources produce no net greenhouse gases.
(ROOT (S (NP (JJ Renewable) (NN energy) (NNS sources)) (VP (VBP emit) (NP (NP (JJR fewer)) (CC or) (NP (DT no) (NN greenhouse) (NNS gases)))) (. .)))