( ( When ( ( a ( natural ( gas company ) ) ) ( ( ( began exploration ) ( in ( western Idaho ) ) ) ( in 2011 ) ) ) ) ( , ( ICL ( ( asked ( ( ( ( the ( Idaho oil ) ) and ) ( Gas ( Conservation Commission ) ) ) ( to ( ( ( prohibit ( carcinogenic chemicals ) ) and ) ( require ( companies ( to ( provide ( ( a bond ) ( ( protecting ( Idaho communities ) ) ( in ( ( the case ) ( of ( a ( fracking emergency ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT a) (JJ natural) (NN gas) (NN company)) (VP (VBD began) (NP (NN exploration)) (PP (IN in) (NP (JJ western) (NNP Idaho))) (PP (IN in) (NP (CD 2011)))))) (, ,) (NP (NNP ICL)) (VP (VBD asked) (S (NP (NP (DT the) (NNP Idaho) (NN oil)) (CC and) (NP (NNP Gas) (NNP Conservation) (NNP Commission))) (VP (TO to) (VP (VP (VB prohibit) (NP (ADJP (JJ carcinogenic)) (NNS chemicals))) (CC and) (VP (VB require) (S (NP (NNS companies)) (VP (TO to) (VP (VB provide) (NP (NP (DT a) (NN bond)) (VP (VBG protecting) (NP (NNP Idaho) (NNS communities)) (PP (IN in) (NP (NP (DT the) (NN case)) (PP (IN of) (NP (DT a) (VBG fracking) (NN emergency))))))))))))))) (. .)))
When a natural gas company began exploration in western Idaho in 2011, ICL asked the Idaho oil and Gas Conservation Commission to prohibit carcinogenic chemicals and require companies to provide a bond protecting Idaho communities in the case of a fracking emergency.
(ROOT (S (NP (NNP Fracking)) (VP (VBZ delivers) (NP (JJ natural) (NN gas)) (PP (IN from) (NP (NP (NN rock)) (SBAR (WHNP (WDT that)) (S (VP (MD might) (RB not) (ADVP (RB otherwise)) (VP (VB be) (ADJP (JJ obtainable))))))))) (. .)))
Fracking delivers natural gas from rock that might not otherwise be obtainable.