( ( ( 97 % ) ( of ( climate experts ) ) ) ( ( agree ( humans ( are ( causing ( global warming ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD 97) (NN %)) (PP (IN of) (NP (NN climate) (NNS experts)))) (VP (VBP agree) (SBAR (S (NP (NNS humans)) (VP (VBP are) (VP (VBG causing) (NP (JJ global) (NN warming))))))) (. .)))
97% of climate experts agree humans are causing global warming.
(ROOT (S (NP (NNP Human) (NNS beings)) (VP (VBP is/are) (NP (NP (DT the) (JJ main) (NN cause)) (PP (IN of) (NP (JJ recent) (JJ global) (NN warming))))) (. .)))
Human beings is/are the main cause of recent global warming.