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Closing the nutrient loop.


 A pattern of hauling nutrients from rural to urban areas prevails in thousands of cities on the planet. This massive shifting of nutrients had diminished the vitality of many of the planet's most productive croplands, grazing lands, and fisheries, and it could accelerate more of the human population concentrates in the cities in the coming decades. It is also creating a dilemma of feeding the growing number of people who are far removed from their main sources of food, without unbalancing and collapsing the ecosystems on which those people ultimately depend. City dwelling people are adopting urban farming to support their feeding needs. The approach will not only feed the people but it can also play an important role in the municipal waste management. Governments are beginning to recognize that local food production may be an important component of food security; these include the US, Germany, the Netherlands, and Canada, where empty lots are turned into farmland that propagates vegetation.
