ThisisSteveEmberwiththeVOASpecialEnglishAgricultureReport. 　　Thisweek,wetakeasuggestionfromalistenerinBrazil.AgriculturalspecialistLuizAugustoVeronainChapecowouldliketohearaboutagroecology（农业生态学）.Hesaysitisasubjectthatthesedays"everybodytalksabout." 　　Thewordagroecologyisgenerallyusedtodescribefarmingmethodsthatcanbecarriedoutinawaythatdoesnotdamagetheenvironment.Sustainabledevelopment（可持续发展）isanothertermoftenusedinconnectionwithagroecology.Sustainabledevelopmentmethodsaredesignedtosaveresources. 　　Interestinagroecologyhasincreasedinrecentyears.Now,manyuniversitiesofferstudiesinthisarea.TheUniversityofCaliforniaatSantaCruzandPennsylvaniaStateUniversityarejusttwooftheschoolsthatofferagroecologyprograms.Manyagriculturalprogramsarealsolinkingstudiesinanimalbiology,soilscienceandotherstudies. 　　Inmanywaysagroecologyisananswertothetechnologicalmovementtoincreaseproductioninsomecrops.Thismovementwhichdevelopedinthe1960sand70sbecameknownastheGreenRevolution（绿色革命）.Scientistsdevelopedwaystomakehighlyproductiveformsofwheat,cornandrice. 　　NormanBorlaughelpedbringabouttheGreenRevolution.MisterBorlaugwasanagriculturalresearcherfortheDuPontCompany.Later,hewenttoMexicowhereheworkedattheInternationalMaizeandWheatImprovementCenter（国际玉米小麦改良中心）.Hebecamethedirector.Healsohelpedcreatenewkindsofhighlyproductivewheat.MisterBorlaugwontheNobelPeacePrizein1970forhiseffortstodevelopmoreproductivecropsandtotrainscientists.Heremainsactiveinthisworktoday. 　　TheGreenRevolutionproducedhugeincreasesincropsizeinIndia,Mexico,PakistanandthePhilippines.Ithasalsoplacedimportanceontheuseofchemicalfertilizersandinsectpoisons,andontheneedfornewcrops.Today'sgeneticallychangedcropsarethenextstep. 　　Agroecologyseekstousescientificknowledgeoftheenvironmenttomakegoodchoicesaboutgrowingcrops.ManyexpertssayitisnotcompetingwiththegoalsoftheGreenRevolution.Theysaybothhaveasinglegoal:tofeedtheworld'speople. 　　Listennextweekaswetellmoreaboutagroecology. 　　ThisVOASpecialEnglishAgricultureReportwaswrittenbyMarioRitter.ThisisSteveEmber.