( However ( , ( ( second ( generation ( biofuel processes ) ) ) ( ( ( is slowly ) ( being ( ( implemented ( in order ) ) ( to ( extend ( ( ( the amount ) ( of biofuel ) ) ( that ( can ( be ( ( produced sustainably ) ( by ( using ( biomass ( consisting ( of ( ( ( ( the ( residual ( non-food parts ) ) ) ( of ( current crops ) ) ) , ) ( such ( as ( stems ( , ( ( leaves and ) husks ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (JJ second) (NN generation) (NN biofuel) (NNS processes)) (VP (VBZ is) (ADVP (RB slowly)) (VP (VBG being) (VP (VBN implemented) (PP (IN in) (NP (NN order))) (S (VP (TO to) (VP (VB extend) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN biofuel))) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN produced) (ADVP (RB sustainably)) (PP (IN by) (S (VP (VBG using) (NP (NP (NNS biomass)) (VP (VBG consisting) (PP (IN of) (NP (NP (DT the) (JJ residual) (JJ non-food) (NNS parts)) (PP (IN of) (NP (JJ current) (NNS crops))) (, ,) (PP (JJ such) (IN as) (NP (NNS stems) (, ,) (NNS leaves) (CC and) (NNS husks)))))))))))))))))))))) (. .)))
However, second generation biofuel processes is slowly being implemented in order to extend the amount of biofuel that can be produced sustainably by using biomass consisting of the residual non-food parts of current crops, such as stems, leaves and husks.
(ROOT (S (NP (NNS Biomass)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN processed) (S (VP (TO to) (VP (VB make) (ADJP (JJ biofuel)))))))) (. .)))