e conom ic - social ▁inter rel ations hips ▁ ▁We alth - based ▁approaches ▁ ▁Me as uring ▁environmental - e conom ic - social ▁inter rel ations hips ▁requires ▁a ▁clear ▁understanding ▁of ▁the ▁relationships ▁that ▁exists ▁between ▁the ▁natural ▁environment ▁and ▁the ▁economy . ▁It ▁is ▁not ▁possible ▁without ▁understanding ▁the ▁physical ▁representation . ▁The ▁physical ▁flow ▁accounts ▁are ▁helpful ▁in ▁showing ▁the ▁characteristics ▁of ▁production ▁and ▁consumption ▁activities . ▁Some ▁of ▁these ▁accounts ▁focus ▁on ▁the ▁physical ▁exchange ▁between ▁the ▁economic ▁system ▁and ▁natural ▁environment . ▁ ▁We alth - based ▁approaches ▁to ▁sust ain ability ▁refer ▁to ▁the ▁pres ervation ▁of ▁stock ▁of ▁wealth . ▁S ust ain ability ▁is ▁observed ▁as ▁the ▁maintenance ▁of ▁the ▁capital ▁base ▁of ▁a ▁country ▁and ▁therefore ▁potentially ▁measured . ▁A ▁number ▁of ▁environmental ▁changes ▁are ▁also ▁contained ▁in ▁these ▁financial ▁statements ▁that ▁are ▁measured ▁during ▁an ▁account ing ▁period ▁of ▁time . ▁ ▁The ▁G RI ▁offers ▁advanced ▁material ▁to ▁help ▁organis ations ▁of ▁all ▁types ▁to ▁create ▁their ▁account ability ▁reports . ▁This ▁published ▁material ▁lead ▁organis ations ▁through ▁the ▁reporting ▁process ▁with ▁the ▁main ▁idea ▁of ▁becoming ▁more ▁sust ain able ▁in ▁their ▁practices ▁in ▁every day ▁business . ▁ ▁Specific ▁techniques ▁to ▁measure ▁information ▁in ▁sust ain ability ▁account ing ▁include : ▁ ▁In ventory ▁Appro ach ▁ ▁S ust ain able ▁Cost ▁Appro ach ▁ ▁Resource ▁Flow / Input - Output ▁Appro ach ▁The ▁In ventory ▁Appro ach ▁focus es ▁on ▁the ▁different ▁categories ▁of ▁natural ▁capital