( ( ( Summer ( minimum ( sea ( ice extent ) ) ) ) ( in ( the Arctic ) ) ) ( ( ( decreased ( over ( the ( last ( 30 years ) ) ) ) ) ( ( ( ( ( ( between 9 ) % ) and ) 14 ) % ) ( per decade ) ) ) . ) )
(ROOT (S (NP (NP (NN Summer) (NN minimum) (NN sea) (NN ice) (NN extent)) (PP (IN in) (NP (DT the) (NNP Arctic)))) (VP (VBD decreased) (PP (IN over) (NP (DT the) (JJ last) (CD 30) (NNS years))) (NP (NP (QP (IN between) (CD 9) (NN %) (CC and) (CD 14) (NN %))) (PP (IN per) (NP (NN decade))))) (. .)))
Summer minimum sea ice extent in the Arctic decreased over the last 30 years between 9% and 14% per decade.
(ROOT (S (NP (NNP Rapid) (NN decrease)) (VP (VBZ is) (NP (NP (DT a) (NN trend)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBG occurring) (S (VP (VBG involving) (NP (NP (DT the) (NN extent)) (PP (IN of) (NP (NP (JJ arctic) (NN sea) (NN ice)) (PP (IN in) (NP (NN summer)))))))))))))) (. .)))