( ( ( The fact ) ( that ( seems ( to ( escape ( many people ) ) ) ) ) ) ( ( is ( ( ( that ( ( a forest ) ( is ( a ( good ( place ( to ( grow ( a tree ) ) ) ) ) ) ) ) ) and ) ( if ( ( ( cut down ) they ) ( do ( ( ( ( grow back ) , ) though ) ( not ( if ( they ( are ( covered ( by ( ( concrete or ) asphalt ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN fact)) (SBAR (WHNP (WDT that)) (S (VP (VBZ seems) (S (VP (TO to) (VP (VB escape) (NP (JJ many) (NNS people))))))))) (VP (VBZ is) (SBAR (SBAR (IN that) (S (NP (DT a) (NN forest)) (VP (VBZ is) (NP (DT a) (JJ good) (NN place) (S (VP (TO to) (VP (VB grow) (NP (DT a) (NN tree))))))))) (CC and) (SBAR (IN if) (S (S (VP (VB cut) (PRT (RP down)) (NP (PRP they)))) (VP (VBP do) (S (VP (VB grow) (ADVP (RB back)) (, ,) (ADVP (RB though)) (SBAR (RB not) (IN if) (S (NP (PRP they)) (VP (VBP are) (VP (VBN covered) (PP (IN by) (NP (NN concrete) (CC or) (NN asphalt)))))))))))))) (. .)))
The fact that seems to escape many people is that a forest is a good place to grow a tree and if cut down they do grow back, though not if they are covered by concrete or asphalt.
(ROOT (S (NP (NNS People)) (VP (MD can) (VP (VB help) (VP (VB keep) (NP (DT a) (NN forest)) (NP (NP (DT a) (JJ good) (NN place)) (PP (IN for) (NP (NNS birds) (S (VP (TO to) (VP (VB live) (PP (IN by) (S (VP (VBG preventing) (NP (ADJP (RB too) (JJ many)) (NNS trees)) (PP (IN from) (S (VP (VBG being) (VP (VBN cut) (PRT (RP down)))))))))))))))))) (. .)))