( Unfortunately ( , ( ( carbon ( in ( the ( ( earth and ) atmosphere ) ) ) ) ( ( is ( locked ( in ( ( ( ( highly oxidized ) forms ) , ) ( such ( as ( ( ( carbonate minerals ) and ) ( carbon ( dioxide gas ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Unfortunately)) (, ,) (NP (NP (NN carbon)) (PP (IN in) (NP (DT the) (NN earth) (CC and) (NN atmosphere)))) (VP (VBZ is) (VP (VBN locked) (PP (IN in) (NP (NP (ADJP (RB highly) (JJ oxidized)) (NNS forms)) (, ,) (PP (JJ such) (IN as) (NP (NP (JJ carbonate) (NNS minerals)) (CC and) (NP (NN carbon) (NN dioxide) (NN gas)))))))) (. .)))
Unfortunately, carbon in the earth and atmosphere is locked in highly oxidized forms, such as carbonate minerals and carbon dioxide gas.
(ROOT (S (NP (JJ Volcanic) (NNS gases)) (VP (VBP helpe) (S (VP (TO to) (VP (VB form) (NP (DT the) (NN atmosphere)) (PP (IN on) (NP (NN earth))))))) (. .)))