The trouble with the urb. farming ‘revolution’

12-04-2019    02:30   |    Emma Bryce/Anthropocene Magazine

Commercial urban agriculture in New York City has provided questionable environmental gains, and has not significantly improved urban food security. These are the findings of a recent case study of New York City which shows that, despite the fanfare over commercial urban farming, it will need a careful re-evaluation if it’s going to play a sustainable role in our future food systems.

The rise of commercial controlled-environment agriculture (CEA)–comprised of large scale rooftop farms, vertical, and indoor farms–is a bid to re-envision cities as places where we could produce food more sustainably in the future. Proponents see CEA as way to bring agriculture closer to urban populations, thereby increasing food security, and improving agriculture’s environmental footprint by reducing the emissions associated with the production and transport of food.

But the researchers on the new paper wanted to explore whether these theoretical benefits are occurring in reality.

They focused on New York City, where CEA has dramatically increased in the last decade. Looking at 10 farms that produce roof- and indoor-grown vegetables at commercial scales, they investigated how much food the farms are producing, who it’s reaching, and how much space is available to expand CEA into.

They found that the biggest of these 10 commercial farms is around a third of an acre in size. Most are on roofs spread across New York City, and some are inside buildings and shipping containers. Mainly, these farms are producing impressive amounts of leafy greens such as lettuce, and herbs; some also produce fish.

But while rooftop farms rely on natural sunlight to feed the crops, indoor farms use artificial lights. These farms potentially have a greater energy footprint even than conventional outdoors farms, the researchers say–challenging the assumption that urban farms are less impactful than conventional ones.

Some farms also embraced high-tech systems, such as wind, rain, temperature, and humidity detectors and indoor heating, to enhance growing conditions in environments that aren’t naturally suited to agriculture. These elevate the energy costs of the food produced, and may be giving CEA an unexpectedly high carbon footprint, the researchers say.

Furthermore, the predominantly grown foods–such as lettuce–aren’t of great nutritional value for the urban population, especially those threatened by food insecurity. Most produce from CEAs is sold at a premium, something that partly reflects the cost of the real estate used to grow the food. Consequently, that produce is typically grown for high-end food stores and restaurants, meaning it’s unlikely to reach low-income urban populations who need it most.   

The researchers also think it’s unlikely that CEA–which currently occupies just 3.09 acres in New York City–could expand into the roughly 1,864 acres they estimate is still suitable for urban farming in New York City.

Click here to read the complete article at Anthropocene Magazine.

Photo credit: Public Domain Pictures, CC0 Public Domain.


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