Eversincemanappearedontheearth,man'ssurvivalhasbeenheavilyreliedonnature.Almosteverythingweuseinoureverydaylifecomesfromnature,rangingfromthefoodweeat,thewaterwedrink,tothewoodwhichisturnedintofurniture.Withthedevelopmentoftechnologyandpopulationgrowth,theamountandrangeofmaterialsusedhasincreasedatanalarmingrate.However,naturalresourcesarenotinexhaustible.Somereservesarealreadyonthebrinkofexhaustionandthereisnohopeofreplacingthem.Thewidespreadwatershortageisanexampleinpoint.Ifmancontinuedtosquandernaturalresourceswithnothoughtforthefuture,thelatergenerationswouldendupsellingsand,asisthecaseinthecartoon,andthewholeworldwouldbeinamess.