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In my opinion, we are living on borrowed time. We have 3 or 4 days" worth of food in the city. And if that food supply is disrupted, we"ll be in a lot of trouble. We should have something in the city that replaces this very tenuous food supply and it should be growing in the city.
The bulk of the world"s population are going to be urban and are going to be living in high-rise accommodation. How do you make sustainable living solutions for the real world
By the year 2050, over 3/4 of the world"s population is expected to live in cities. The trend towards urbanization is greater now than at any time in history. And as population grows, it poses a unique problem: how best to grow food and supply it to the cities We are looking at the exciting and unconventional field of agriculture, that is vertical farming. It could radically change the view across the Thames here in London.

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我认为我们正处在危险状态之中。城市里只有三四天的粮食储备。如果这种粮食供给遭到破坏，我们就会遭遇很多麻烦。人们应该拥有某......

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Our hypothesis is that immigrants, who often do not speak the language and do not master the culture and norms of the host country, are concentrated in more manual-routine tasks (especially among less educated groups). The inflow of immigrants thus increases the supply of manual skills relative to the supply of abstract skills with two effects:●Due to the complementarity between these types of skills, the increase in the supply of manual tasks boosts relative compensation for complex skills, making them better paid.●Exploiting their comparative advantage, natives move to occupations requiring a relatively higher level of these skills.This positive reallocation and the complementarity of tasks can explain the lack of negative employment effects as well as the potential positive wage effects of immigration on native workers.So here s how it all shakes out. Low-skilled immigration reduces economic inequality when we set aside nationalist assumptions and focus on people instead of populations. Even if we cling to analytical and moral nationalism, low-skilled immigration doesn t happen to increase measured inequality. On the contrary, complementaries between the skills of migrant and native workers can leave natives better off than they would have been with less immigration.
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In much of the developing world, lack of water is at the center of a vicious circle of inequality. Some women in Foro come clown to the river five times a day—with one or two of the trips devoted to getting water to make a beer-style home brew for their husbands. When I first came to Foro, some 60 men were sitting in the shade of a metal-roofed building, drinking and talking. It was midmorning. Women, says Binayo, never get five seconds to sit down and rest. On a hot late afternoon I go with her to the river, carrying an empty jerry can. The trail is steep and in places slippery. We scramble down large rocks alongside cacti and thornbushes. After 50 minutes we reach the river—or what is a river at certain times of the year. Now it is a series of black, muddy pools, some barely puddles. The banks and rocks are littered with the excrement of donkeys and cows. There are about 40 people at the river, enough so that Binayo decides that the wait might be shorter upstream. The wait is especially long early in the morning, so Binayo usually makes her first trip before it is light, leaving her son Kumacho, a serious-faced little man who looks even younger than his four years, in charge of his younger brothers.
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