( ( ( ( ( To ( stop polluting ) ) and ) ( to ( encourage ( other people ) ) ) ) ( not ( to ( pollute either ) ) ) ) . )
(ROOT (S (VP (VP (TO To) (VP (VB stop) (NP (VBG polluting)))) (CC and) (VP (TO to) (VP (VB encourage) (NP (JJ other) (NNS people)))) (S (RB not) (VP (TO to) (VP (VB pollute) (ADVP (RB either)))))) (. .)))
To stop polluting and to encourage other people not to pollute either.
(ROOT (S (NP (NNS People)) (VP (VBD stopped) (S (VP (VBG adding) (NP (NN lead)) (PP (TO to) (NP (NP (NN gasoline)) (PP (RB because) (IN of) (NP (JJ environmental) (NN pollution)))))))) (. .)))