( ( ( Acid Rain ) ( is ( caused ( from ( air ( pollution Scientists ) ) ) ) ) ) ( ( have ( discovered ( that ( ( ( air pollution ) ( from ( ( the burning ) ( of ( fossil fuels ) ) ) ) ) ( is ( ( the ( major cause ) ) ( of ( acid rain ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Acid) (NN Rain)) (SBAR (S (VP (VBZ is) (VP (VBN caused) (PP (IN from) (NP (NN air) (NN pollution) (NNS Scientists)))))))) (VP (VBP have) (VP (VBN discovered) (SBAR (IN that) (S (NP (NP (NN air) (NN pollution)) (PP (IN from) (NP (NP (DT the) (NN burning)) (PP (IN of) (NP (JJ fossil) (NNS fuels)))))) (VP (VBZ is) (NP (NP (DT the) (JJ major) (NN cause)) (PP (IN of) (NP (JJ acid) (NN rain))))))))) (. .)))
Acid Rain is caused from air pollution Scientists have discovered that air pollution from the burning of fossil fuels is the major cause of acid rain.
(ROOT (S (NP (JJ Acid) (NN rain)) (VP (MD may) (VP (VB be) (VP (VBN caused) (PP (IN by) (NP (NN air) (NN pollution)))))) (. .)))