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Grazinglivestock—asustainableandproductiveapproach,”Adelaide&MtLoftyRangesNaturalResourceManagementBoard,accessedMarch10,2013,www.amlrnrm.sa.gov.au/Portals/2/landholders_info/grazing_web.pdf;“EuropeanUnion,”CIA—TheWorldFactbook,accessedMarch16,2013,https://www.cia.gov/library/publications/the-world-factbook/geos/ee.html.根据第个来源，假设公顷土地可以养活十只成年羊，如果年中有十二个月可以放牧话。这是用来计算养70亿只羊所需土地面积，然后与欧盟面积进行比较。根据《中央情报局世界实况手册》（CIAWorldFactbook），欧盟面积为4324782平方公里。

5EdwardBaines,HistoryoftheCottonManufactureinGreatBritain(London:H.Fisher,R.Fisher,andP.Jackson,1835),5–6;seeKennethPomeranz,TheGreatDivergence:China,Europe,andtheMakingoftheModernWorldEconomy(Princeton,NJ:PrincetonUniversityPress,2000).

6JaredDiamond,Guns,Germs,andSteel:TheFatesofHumanSocieties(NewYork:Norton,1998);DavidLandes,TheWealthandPovertyofNation