写以"populationproblem"为题写一篇英语作文提示；10000yearsago,small,butlastthreeorfourhundredyears,quickly,today,fastor,families,children,notbad,space.
写以"populationproblem"为题写一篇英语作文
提示；10000yearsago,small,butlastthreeorfourhundredyears,quickly,today,fastor,families,children,notbad,space.
TheProblemofHumanPopulation
Ithasbeenestimatedthatathousandyearsagotherewerelessthan400millionpeopleonearth.Today,however,theworld’spopulationhasamountedto5,000million.Whatisworse,itkeepsgrowingatasurprisingspeed.Ifthistrendcontinues,theworld’spopulationwillshootupto7,000millionbytheyear2000.Thisiswhatwecallpopulationexplosion.
Therapiddevelopmentofscienceandtechnologyisthemaincauseofpopulationexplosion.WecanseethatthepopulationhasbeengrowingatatremendousspeedsincetheIndustrialandAgricultureRevolutionin1650,whichraisedthepeople’sstandardofliving,andtheemergenceofmodernmedicinein1550,whichloweredthepeople’sdeathrate.
Populationexplosionwillresultinalotofsuchproblemsasfoodshortage,housingshortageandunemployment.Itistimethatweactedquicklytocarryoutthepolicyofbirthcontrolotherwise,man’ssurvivalontheearthwillbethreatened.