0 s . ▁Ent ire ▁power ▁stations ▁that ▁are ▁run ▁by ▁f ission - elect ric ity ▁are ▁known ▁to ▁have ▁emission ▁values ▁that ▁are ▁lower ▁than ▁that ▁of ▁renew able ▁energy ▁stations ▁in ▁terms ▁of ▁a ▁green house ▁gas ▁em issions ▁per ▁cycle ▁( of ▁a ▁generated ▁unit ▁of ▁energy ). ▁The ▁median ▁value ▁of ▁all ▁commercial ▁sources ▁for ▁bas elo ad ▁energy ▁is ▁lowest ▁for ▁this ▁method ▁and ▁second ▁to ▁lowest ▁for ▁all ▁techn ologies ▁of ▁commercial ▁electric ity . ▁The ▁first ▁establish ments ▁of ▁these ▁plants ▁prevent ed ▁ 6 4 ▁billion ▁t onnes ▁of ▁carbon ▁dio x ide , ▁em itted ▁by ▁the ▁thermal ▁power ▁stations ▁that ▁burn ▁foss il ▁fu els . ▁N uc lear ▁power ▁is ▁acc laimed ▁by ▁the ▁World ▁N uc lear ▁Association ▁and ▁Environment al ists ▁for ▁N uc lear ▁Energy ▁to ▁be ▁the ▁safe ▁and ▁sust ain able ▁energy ▁source ▁in ▁reducing ▁carbon ▁em issions . ▁Ret ros pect ively , ▁the ▁corpor ations ▁of ▁Green pe ace ▁International ▁and ▁N IR S ▁are ▁known ▁to ▁be ▁opposed ▁to ▁nuclear ▁power , ▁arg uing ▁that ▁it ▁threat ens ▁the ▁environment ▁more ▁than ▁anything . ▁ ▁Car bon ▁Capt ure ▁Storage ▁( CC S ) ▁▁ ▁Car bon ▁dio x ide ▁is ▁a ▁major ▁green house ▁gas ▁that ▁cont ributes ▁to ▁climate ▁change , ▁and ▁its ▁levels ▁have ▁increased ▁from ▁human ▁activity , ▁prom oting ▁inc idents ▁such ▁as ▁foss il ▁fuel ▁comb ust ion . ▁One ▁of ▁the ▁main ▁techn ologies ▁meant ▁for