▁Pro posed ▁dispos al ▁routes ▁of ▁waste ▁sor b ent ▁include : ▁ ▁Land fill ; ▁ ▁Dis pos al ▁at ▁sea ; ▁ ▁Use ▁in ▁c ement ▁manufact ure ; ▁ ▁Use ▁in ▁fl ue ▁gas ▁des ulf ur isation ▁( F G D ). ▁ ▁The ▁lif ecycle ▁CO 2 ▁em issions ▁for ▁power ▁generation ▁with ▁Ca L ▁and ▁the ▁first ▁three ▁dispos al ▁techniques ▁have ▁been ▁calculated . ▁Before ▁dispos al ▁of ▁the ▁Ca O ▁coal ▁power ▁with ▁Ca L ▁has ▁a ▁similar ▁level ▁of ▁lif ecycle ▁em issions ▁as ▁am ine ▁scr ub bing ▁but ▁with ▁the ▁CO 2 - abs or bing ▁properties ▁of ▁Ca O ▁Ca L ▁becomes ▁significantly ▁less ▁poll uting . ▁Ocean ▁dispos al ▁was ▁found ▁to ▁be ▁the ▁best , ▁but ▁current ▁laws ▁rel ating ▁to ▁dump ing ▁waste ▁at ▁sea ▁prevent ▁this . ▁Next ▁best ▁was ▁use ▁in ▁c ement ▁manufact ure , ▁reducing ▁em issions ▁over ▁an ▁un ab ated ▁coal ▁plant ▁by ▁ 9 3 %. ▁ ▁Use ▁in ▁c ement ▁manufact ure ▁ ▁Port land ▁c ement ▁is ▁approximately ▁two - third s ▁calci um ▁ox ide ▁by ▁mass ▁and ▁its ▁manufact ure ▁is ▁responsible ▁for ▁approximately ▁ 8 % ▁of ▁the ▁world ' s ▁CO 2 ▁ ▁em issions . ▁ 6 0 % ▁of ▁this ▁CO 2 ▁ ▁comes ▁from ▁the ▁calc ination ▁of ▁calci um ▁carbon ate ▁as ▁shown ▁earlier ▁in ▁this ▁article , ▁and ▁the ▁other ▁ 4 0 % ▁from ▁foss il ▁fuel ▁comb ust