We are concerned that the significant emissions reductions are required too quickly.
( We ( ( are ( concerned ( that ( ( the ( significant ( emissions reductions ) ) ) ( are ( required ( too quickly ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP are) (ADJP (VBN concerned) (SBAR (IN that) (S (NP (DT the) (JJ significant) (NNS emissions) (NNS reductions)) (VP (VBP are) (VP (VBN required) (ADVP (RB too) (RB quickly)))))))) (. .)))
Fast emission reduction is bad. 
( ( Fast ( emission reduction ) ) ( ( is bad ) . ) )
(ROOT (S (NP (JJ Fast) (NN emission) (NN reduction)) (VP (VBZ is) (ADJP (JJ bad))) (. .)))