| http://www.w3.org/ns/prov#value | - Urban soils can be loaded with lead, arsenic, and other toxins, requiring remediation or replacement before planting can be done safely.Cramped conditions can limit yields, and getting enough water and sunlight can be concerns.Still, if the right combinations of new technology, community support, and economic incentives align, it is possible we may soon be munching on skyscraper scallions and avenu
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