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1、Whenwethinkaboutthreatstotheenvironment,wetendtopicturecarsandsmokestacks,notdinner.Butthetruthis,ourneedforfoodposesoneofthebiggestdangerstotheplanet.Source:NationalGeographicAgricultureisamongthegreatestcontributorstoglobalwarming,emittingmoregreenhousegasesthanallourcars,trucks,trains,andai
2、rplanescombined—largelyfrommethanereleasedbycattleandricefarms,nitrousoxidefromfertilizedfields,andcarbondioxidefromthecuttingofrainforeststogrowcropsorraiselivestock.Farmingisthethirstiestuserofourpreciouswatersuppliesandamajorpolluter,asrunofffromfertilizersandmanuredisruptsfragilelakes,rive
3、rs,andcoastalecosystemsacrosstheglobe.Agriculturealsoacceleratesthelossofbiodiversity.Aswe’veclearedareasofgrasslandandforestforfarms,we’velostcrucialhabitat,makingagricultureamajordriverofwildlifeextinction.Source:NationalGeographicTheenvironmentalchallengesposedbyagriculturearehuge,andthey’l
4、lonlybecomemorepressingaswetrytomeetthegrowingneedforfoodworldwide.We’lllikelyhavetwobillionmoremouthstofeedbymid-century—morethanninebillionpeople.Butsheerpopulationgrowthisn’ttheonlyreasonwe’llneedmorefood.Thespreadofprosperityacrosstheworld,especiallyinChinaandIndia,isdrivinganincreaseddema
5、ndformeat,eggs,anddairy,boostingpressuretogrowmorecornandsoybeanstofeedmorecattle,pigs,andchickens.Ifthesetrendscontinue,thedoublewhammyofpopulationgrowthandricherdietswillrequireustoroughlydoubletheamountofcropswegrowby2050.Source:NationalGeographicUnfortunatelythedebateoverhowtoaddresstheglo
6、balfoodchallengehasbecomepolarized,pittingconventionalagricultureandglobalcommerceagainstlocalfoodsystemsandorganicfarms.Theargumentscanbefierce,andlikeourpolitics,weseemtobegettingmoredividedratherthanfindingcommonground.Thosewhofavorconventionalagriculturetalkabouthowmodernmechanization,irri
7、gation,fertilizers,andimprovedgeneticscanincreaseyieldstohelpmeetdemand.Andthey’reright.Meanwhileproponentsoflocalandorganicfarmscounterthattheworld’ssmallfarmerscouldincreaseyieldsplenty—andhelpthemselvesoutofpoverty—byadoptingtechniqu
