( ( ( The ( actual extinction ) ) ( of ( the ( human species ) ) ) ) ( , ( however ( , ( ( ( ( will ( most probably ) ) not ) occur ) . ) ) ) ) )
(ROOT (S (NP (NP (DT The) (JJ actual) (NN extinction)) (PP (IN of) (NP (DT the) (JJ human) (NN species)))) (, ,) (ADVP (RB however)) (, ,) (VP (MD will) (ADVP (RBS most) (RB probably)) (RB not) (VP (VB occur))) (. .)))
The actual extinction of the human species, however, will most probably not occur.
(ROOT (S (NP (NNP Human) (NNS actions)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NN extinction)) (PP (IN of) (NP (NP (NNS hundreds)) (PP (IN of) (NP (NP (NNS species)) (PP (IN of) (NP (NNS birds))))))))))) (. .)))