Oncemandidnothavetothinkabouttheprotectionofhisenvironment.Therewerefewpeopleontheearth,andnaturalresourcesseemedtobeunlimited.
Todaythingsaredifferent.Theworldhasbecometoocrowded.Weareusingupournaturalresources,andpollutingourenvironmentwithdangerouschemicals.Ifwecontinuetodothis,humanlifeonearthwillnotsurvive.
Werealizethatiftoomanyfisharetakenfromthesea,therewillsoonbenoneleft.Yet,withmodernfishingmethods,moreandmorefisharecaught.Weknowthatiftoomanytreesarecutdown,forestswilldisappear.Yet,wecontinuetousepowerfulmachinestocutdownmoreandmoretrees.Weseethatifriversarepollutedwithwasteproducts,wewilldie.Yet,wasteproductsare
stillputintorivers.
Weknowthatifthepopulationcontinuestoriseatthepresentrate,inafewyears,therewon＇tbeenoughfood.Whatcanwedotosolvetheseproblems?
Ifweeatmorevegetablesandlessmeat,therewillbemorefoodavailable.Landforcropsfeedsfivetimesmorepeoplethanlandwhereanimalsarekept.
Ournaturalresourceswilllastlongerifwelearntorecyciethem.
Theworldpopulationwillnotrisesoquicklyifpeopleusemodernmethodsofbirthcontrol.
Finally,ifweeducatepeopletothinkabouttheproblemsweshallhaveabetterandcleanerplanetinthefuture.