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istryofAgricultureestimates我们把这么多资源耗费在动物身上，又得到什么回报呢？粪肥据官方资料，仅加拿大，就以每秒10000多公斤的速度排出。加拿大环境部称，牛每产1公斤可食牛肉需排出40公斤粪便。安大略省农业部估测，一家大型禽蛋工厂每星期可产出50－100吨禽粪。18A
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