Esinye isisombululo sokugcina iipleyiti zobunzima, i-footprint encinci ivumela ukuba utshintshe indawo eguquguqukayo ngelixa ugcina ukuhambelana neentlobo ezahlukeneyo zeepleyiti zobunzima.Ndiyabulela kwi-DHZ yokubonelela ngamandla kunye nemveliso, isakhiwo sesakhelo sezixhobo sihlala sihlala kwaye sinewaranti yeminyaka emihlanu.
