( ( ( the depletion ) ( of ( this layer ) ) ) ( ( is ( increasing ( ( ( the amount ) ( of ( ultraviolet radiation ) ) ) ( that ( can ( pass ( through it ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT the) (NN depletion)) (PP (IN of) (NP (DT this) (NN layer)))) (VP (VBZ is) (VP (VBG increasing) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (JJ ultraviolet) (NN radiation))) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB pass) (PP (IN through) (NP (PRP it)))))))))) (. .)))
the depletion of this layer is increasing the amount of ultraviolet radiation that can pass through it.
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (JJ ultraviolet) (NN radiation)))) (VP (MD can) (VP (VP (VB increase) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN pigment)))) (PP (IN in) (NP (DT the) (NN skin)))) (CC and) (VP (VB make) (S (NP (PRP it)) (VP (VB appear) (NP (JJR darker))))))) (. .)))