This is why cities can’t grow all their own food - Conservation
▻http://conservationmagazine.org/2016/01/this-is-why-cities-cant-grow-all-their-own-food
If every homeowner in Seattle ripped up their lawn and replaced it with edible plants, the resulting crop production would be enough to feed just one percent of the city’s residents, according to a new study by researchers at the University of Washington.
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They chose nine crops that are well suited to Seattle’s climate – beets, squash, potatoes, carrots, dry beans, barley, kale, hazelnuts, and apples – and calculated the amount of each that would supply the proper amount of calories, protein, carbohydrates, fat, and micronutrients.
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If all of Seattle’s land in full sun were planted out with crops, it would produce just over 21 percent of the food necessary. But this would require installing gardens on every rooftop, as well as ripping up streets and other impervious surfaces to plant vegetables. And at a certain point, a city without a functioning street grid isn’t really a city anymore.
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If grassy areas throughout Seattle (not just in residential zones) were converted to agriculture, this would yield four percent of the city’s food needs. The tradeoffs here aren’t trivial – where would the kids play soccer? – but the authors say that this number represents a reasonable estimate of Seattle’s maximum food crop production capacity (MFCPC).
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Amid growing interest in urban agriculture and concern about “food miles” traveled from farm to plate, the study is, at first glance, sobering. One to four percent – that’s it? But even if city-grown food can’t supply all nutritional needs, vegetables like kale, spinach, chard, and lettuce have lots of nutrients, can be grown in small spaces, tolerate partial shade, and could increase access to fresh produce in “food deserts” where its availability is currently limited.
Donc l’#agriculture_urbaine des jardins/pelouses privées de Seattle pourrait produire 1% des besoins alimentaires (calories, protéines ?), et ça monte à 4% si on y met les surfaces cultivables publiques (parcs, terrains de foot ?)
Ca serait intéressant de croiser les surfaces trouvées avec de la #biointensive ou le scénario « One circle diet »
