▁A ▁Framework ▁for ▁E vol ving ▁S ust ain ability , ▁the ▁Reg en esis ▁Group ▁as ser ts ▁that ▁the ▁sust ain ability ▁“ deb ate ▁is ▁sh ifting ▁from ▁whether ▁we ▁should ▁work ▁on ▁sust ain ability ▁to ▁how ▁we ’ re ▁going ▁to ▁get ▁it ▁done .” ▁ ▁S ust ain ability ▁was ▁first ▁viewed ▁as ▁a ▁“ st ead y ▁state ▁of ▁equilibrium ” ▁in ▁which ▁there ▁was ▁a ▁balance ▁between ▁inputs ▁and ▁outputs ▁with ▁the ▁idea ▁that ▁sust ain able ▁practices ▁meant ▁future ▁resources ▁were ▁not ▁comprom ised ▁by ▁current ▁processes . ▁As ▁this ▁idea ▁of ▁sust ain ability ▁and ▁sust ain able ▁building ▁has ▁become ▁more ▁widely ▁accepted ▁and ▁adopted , ▁the ▁idea ▁of ▁“ net - zero ” ▁and ▁even ▁“ net - pos itive ” ▁have ▁become ▁topics ▁of ▁interest . ▁These ▁relatively ▁newer ▁concepts ▁focus ▁on ▁posit ively ▁impact ing ▁the ▁surrounding ▁environment ▁of ▁a ▁building ▁rather ▁than ▁simply ▁reducing ▁the ▁negative ▁impact s . ▁ ▁Reg ener ative ▁Design ▁ ▁J . T . ▁Gib ber d ▁argued ▁“ a ▁building ▁is ▁an ▁element ▁set ▁within ▁wider ▁human ▁endeav ors ▁and ▁is ▁necessarily ▁dependent ▁on ▁this ▁context . ▁Thus , ▁a ▁building ▁can ▁support ▁sust ain able ▁patterns ▁of ▁living , ▁but ▁in ▁and ▁of ▁itself ▁cannot ▁be ▁sust ain able ” ▁Reg ener ative ▁design ▁goes ▁a ▁step ▁further ▁than ▁sust ain able ▁design . ▁In ▁a ▁reg ener ative ▁system , ▁feedback ▁loops ▁allow ▁for ▁adapt ability , ▁dynam ism ▁and