( ( In general ) ( , ( however ( , ( ( renewables ( such ( as ( ( solar and ) ( wind energy ) ) ) ) ) ( ( ( have ( a ( smaller impact ) ) ) ( on ( ( the environment ) ( than ( ( ( fossil fuels ) and ) ( nuclear power ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN In) (NP (NN general))) (, ,) (ADVP (RB however)) (, ,) (NP (NP (NNS renewables)) (PP (JJ such) (IN as) (NP (NP (JJ solar)) (CC and) (NP (NN wind) (NN energy))))) (VP (VBP have) (NP (DT a) (JJR smaller) (NN impact)) (PP (IN on) (NP (NP (DT the) (NN environment)) (PP (IN than) (NP (NP (JJ fossil) (NNS fuels)) (CC and) (NP (JJ nuclear) (NN power))))))) (. .)))
In general, however, renewables such as solar and wind energy have a smaller impact on the environment than fossil fuels and nuclear power.
(ROOT (S (NP (NP (NNP Solar)) (CC and) (NP (NN wind))) (VP (VBP are) (ADVP (RB still)) (ADJP (JJ expensive)) (PP (VBN compared) (PP (TO to) (NP (JJ fossil) (NNS fuels))))) (. .)))