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Doubts on organic farming’s ‘sustainability’ claims
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“sustainable” has become one of the buzzwords of the 21st century.
But, as with many vague, feel-good concepts, “sustainability” contains more than a little sophistry. For example, sustainability in agriculture is often linked to organic farming, whose advocates tout it as a “sustainable” way to feed the planet’s rapidly expanding population.
But what does “sustainable” really mean, and how does it relate to organic methods of food production?
The organic movement’s claims about the sustainability of its methods are dubious. For example, a recent study found that the potential for groundwater contamination can be dramatically reduced if fertilizers are distributed through the irrigation system according to plant demand during the growing season; organic farming, however, depends on compost, the release of which is not matched to plant demand.
Moreover, though composting receives good press as a “green” practice, it generates a significant amount of greenhouse gases (and is often a source of pathogenic bacteria in crops).
The study also found that “intensive organic agriculture relying on solid organic matter, such as composted manure that is mixed in to the soil prior to planting, resulted in significant down-leaching of nitrate” into groundwater. Increasing the nitrate levels in groundwater is hardly a hallmark of sustainability, especially with many of the world’s most fertile farming regions in the throes of drought.
A fundamental reason that organic food production is far less “sustainable” than many forms of conventional farming is that organic farms, though possibly well adapted for certain local environments on a small scale, produce far less food per unit of land and water. The low yields of organic agriculture — typically 20 to 50 percent below conventional agriculture — impose various stresses on farmland, especially on water consumption.
A British meta-analysis published in 2012 identified some of the stresses that were higher in organic agriculture. For example, it found that “ammonia emissions, nitrogen leaching, and nitrous oxide emissions per product unit were higher from organic systems,” as were “land use, eutrophication potential, and acidification potential per product unit.”
GM plants
At the same time, organic producers do use insecticides and fungicides to protect their crops, despite the green myth that they do not. More than 20 chemicals (mostly containing copper and sulfur) are commonly used in growing and processing organic crops — all acceptable under US rules for certifying organic products.
Perhaps the most illogical and least sustainable aspect of organic farming in the long term is the exclusion of “genetically engineered” (also known as genetically modified or GM) plants — but only those that were modified with the most precise techniques and predictable results.
Except for wild berries and wild mushrooms, virtually all the fruits, vegetables, and grains in European and North American diets have been genetically improved by one technique or another — often as a result of seeds being irradiated or undergoing hybridizations that move genes from one species or genus to another in ways that do not occur in nature.
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