( ( Most ( of ( the ( human-induced aerosols ) ) ) ) ( ( come ( ( ( from ( sulfur ( released ( in ( fossil ( fuel burning ) ) ) ) ) ) and ) ( from ( burning ( vegetation ( to ( clear ( agricultural land ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (DT the) (JJ human-induced) (NNS aerosols)))) (VP (VBP come) (PP (PP (IN from) (NP (NP (NN sulfur)) (VP (VBN released) (PP (IN in) (NP (JJ fossil) (NN fuel) (NN burning)))))) (CC and) (PP (IN from) (S (VP (VBG burning) (S (NP (NNP vegetation)) (VP (TO to) (VP (VB clear) (NP (JJ agricultural) (NN land)))))))))) (. .)))
Most of the human-induced aerosols come from sulfur released in fossil fuel burning and from burning vegetation to clear agricultural land.
(ROOT (S (NP (DT The) (NN element) (NN sulfur)) (VP (VBZ is) (VP (VBN released) (PP (IN into) (NP (DT the) (NN atmosphere))) (PP (IN by) (NP (NP (DT the) (NN burning)) (PP (IN of) (NP (JJ fossil) (NNS fuels))))))) (. .)))