( ( For ( ( the ( first time ) ) ( in ( global history ) ) ) ) ( , ( ( on ( a ( global level ) ) ) ( , ( man ( ( has ( ( ( begun ( to ( subvert ( ( the ( various systems ) ) ( supporting ( ( the life ) ( of ( the biosphere ) ) ) ) ) ) ) ) , ) ( as ( is ( evident ( in ( ( the changes ) ( of ( ( the ( climate system ) ) ( caused ( by ( ( the change ) ( in ( the ( atmosphere ( s composition ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN For) (NP (NP (DT the) (JJ first) (NN time)) (PP (IN in) (NP (JJ global) (NN history))))) (, ,) (PP (IN on) (NP (DT a) (JJ global) (NN level))) (, ,) (NP (NN man)) (VP (VBZ has) (VP (VBN begun) (S (VP (TO to) (VP (VB subvert) (NP (NP (DT the) (JJ various) (NNS systems)) (VP (VBG supporting) (NP (NP (DT the) (NN life)) (PP (IN of) (NP (DT the) (NN biosphere))))))))) (, ,) (SBAR (IN as) (S (VP (VBZ is) (ADJP (JJ evident) (PP (IN in) (NP (NP (DT the) (NNS changes)) (PP (IN of) (NP (NP (DT the) (NN climate) (NN system)) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (NN change)) (PP (IN in) (NP (DT the) (NN atmosphere) (NN s) (NN composition)))))))))))))))) (. .)))
For the first time in global history, on a global level, man has begun to subvert the various systems supporting the life of the biosphere, as is evident in the changes of the climate system caused by the change in the atmosphere s composition.
(ROOT (S (SBAR (WHADVP (WRB How)) (S (NP (NN ice) (NNS cores)) (VP (VBP are) (ADJP (JJ important) (PP (TO to) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (JJ geologic) (NN history))))))))) (VP (VBZ is) (ADVP (RBS best)) (VP (VBN described) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP contain) (NP (NN evidence) (NN showing) (NNS changes)) (PP (IN in) (NP (NP (DT the) (JJ atmospheric) (NN composition)) (PP (IN over) (NP (NN time)))))))))) (. .)))