forquitealongtimeinmankindhistory,wehumanbeingsthouughtwecoulddominatethenature,wecandowhateverwearepleasedtodowithnature.butnowweknowwewerecompletelywrong.

　　sincethemiddleof20thcentury,thewholeplanetofearthhasbeenexperiencingagreatdealofenvrionmentalchangesduetoincreasinglyintensivehumanactivities.globalwarming,deforestation,waterpollution,soilerosionareallamongthem.thesechangesinturnexertesnegativeimpactonmankindcommunitysuchimpedingthefurtherdevelopmentofeconomy,posinghealthrisksonman,wideningthebridgebetweenthepoorandthewealthyandetc..it'snotexaggeratingtosaythatnatureisretaliating.

　　nowweknownomatterhowadvancedourtechnologyis,humanbeingsshouldneverthinkofourselvesasthemasterofnature.wecanneverbe.theonlywayforustosustainistoregardourselvesaspartofawholesystemoftheplanetlikeaspeciesofplantoranimal,andtoensuretheplanetitselfcanexistanddevelopinitsowncourse.indoingsomanandtheearthliveinharmonyandwebothgettosustain.