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    When we think of food farming we usually think of green fields in the country, outside the city. Sam Chee works on a very different type of farm, in the center of the Canadian city of Toronto. “We grow fruit, vegetables and herbs,” says Sam. “But not many people know the farm is here. You can't see it from the street. We're on top of an office building, 50 meters above the ground.”
    Rooftop farming is becoming popular in cities like Toronto, New York and London. The roofs of buildings are often just wasted space, but this space can be used for growing good fresh food, right in the middle of the city. Sam explains how it works. “We grow everything in big boxes—there are hundreds of them. We catch rainwater to water the plants when the weather is dry.”
    The rooftop farm where Sam works belongs to a restaurant called Green Garden, on the ground floor of the building. The farm produces about half the restaurant's fruit and vegetables. Sam believes that the rooftop farm is what makes Green Garden special. “We help to keep food production local. We don't need to transport this food from anywhere and that saves energy. It's better for the environment.”
    The food from the rooftop is fresher too. “When the fruit and vegetables are ripe we can pick them and use them right away. They taste better when they're really fresh,” says Sam. “I hope that there will be more rooftop farms in the city soon. It could be the farming of the future.”
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    臣闻吏议逐,窈以为过矣。昔穆公求士,西取由余于戎,东得百里奚于宛,迎蹇叔于宋,来丕豹、公孙支于晋。此五人者,不产于秦,而穆公用之,并国二十,遂霸西戎。孝公用商鞅之法,移风易俗,民以殷盛,国以富强,百姓乐用,诸侯亲服,获楚、魏之师,举地千里,至今治强。惠王用张仪之计,拔三川之地,西并巴蜀,北收上郡,南取汉中,包九夷,制鄢郢,东据成皋之险,割膏腴之壤,遂散六国之众,使之西面事秦,功施到今。昭王得范雎,废穰侯,逐华阳,强公室,杜私门,蚕食诸侯,使秦成帝业此四君者皆以客之功由此观之客何负于秦哉向使四君却客而不内疏士而不用是使国无富利之实而秦无强大之名也

    今陛下致昆山之玉,有随、和之宝,垂明月之珠,服太阿之剑,求纤离之马,建翠凤之旗,树灵鼍之鼓。此数宝者,秦不生一焉,而陛下说之,何也?必秦国之所生然后可,则是夜光之用,西蜀丹青不为采。所以饰后宫、充下陈、娱心意、说耳目者,必出于秦然后可,则是宛珠之簪、傅玑之珥、阿缟之衣、锦绣之饰,不进于前;而随俗雅化、佳冶窈窕赵女,不立于侧也。夫击瓮叩缶、弹筝搏髀,而歌呼鸣鸣,快耳目者,真秦之声也。郑卫桑间、《昭虞》《武象》者,异国之乐也。今弃击瓮而就郑卫,退弹筝而取昭虞,若是者何也?快意当前,适观而已矣。今取人则不然。不问可否,不论曲直,非秦者去,为客者逐。然则是所重者,在乎色乐珠玉;而所轻者,在乎人民也。此非所以跨海内、制诸侯之术也。

    臣闻地广者粟多,国大者人众,兵强则士勇。是以泰山不让土壤,故能成其大;河海不择细流,故能就其深;王者不却众庶,故能明其德。是以地无四方,民无异国,四时充美,鬼神降福,此五帝三王之所以无敌也。今乃弃黔首以资敌国,却宾客以业诸候,使天下之士,退而不敢西问,裹足不入秦,此所谓藉寇兵而赍盗粮者也。

    夫物不产于秦,可宝者多;士不产于秦,而愿忠者众。今逐客以资敌国,损民以益仇,内自虚而外树怨于诸侯,求国无危,不可得也。