Developmentsinurbanarea,whichresultsituationofurbanenvironmentprogressivelybecomeonlygoingforwardeconomicalbutretreatecologically.Thoughurbanstabilityisveryimportantecologically,itisthesameimportantasitsstabilityvalueeconomical.Annoyedstabilityofurbanecosystemshowednature'sreactionintheformof:theincreasingofairtemperature,degradationofgroundwater,floods,degradationofsurfaceofland,seawaterintrusion,coastalabrasion,contaminationofwaterintheformofdrinkingwatersmell,containingheavymetal,contaminationofairliketheincreasingofrateofCO,ozone(O3),carbon-dioxide(CO2),nitrogenoxide(NOx)andbrimstone(S),dirt,barrenatmosphere,monotonous,dirtyandnoisy.SomemetropolisanddevelopingcitiesinIndonesiaaredevelopingurbanforeststoanticipatetheabove-mentionedproblems.
