Rethinking the Planet’s Food Footprint: How Shifting Staples to Orange-Fleshed Sweet Potato Could Revolutionize Land, Water and Carbon Economics

Wisdom Richard Mgomezulu, Paul Thangata, Beston B. Maonga and Moses Chitete

No 397908, 100th Annual Conference, March 23-25, 2026, Wadham College, University of Oxford, Oxford, UK from Agricultural Economics Society (AES)

Abstract: Orange-fleshed sweet potato (OFSP) is often overshadowed by globally traded cereals, yet comprehensive evidence now positions it as a strategic climate-nutrition asset. We synthesized 618 farm-gate life-cycle observations around the globe to evaluate the environmental consequences of replacing conventional staples with OFSP. Seemingly Unrelated Regression disentangled correlated production decisions and revealed that, per kilogram of edible output, OFSP reduces greenhouse-gas emissions by 28%, blue-water withdrawals by 37%, and land occupation by 31%, even after controlling for fertilizer use, irrigation status, climate zone, and regional effects. Thus, shifting to OFSP would tremendously shrink agriculture’s carbon footprint and turbo-charging vitamin A intake in nutrient-insecure communities. Yet the narrative is not one of blind substitution. First, we note that despite OFSP supplying up to 100% of a child’s daily vitamin A in a 125g serving, its protein density is way lower than that of wheat or maize, imposing implications on amino-acid intake unless legumes or animal sources rise concurrently. Second, we note perishability bottlenecks to feed-grain deficits and test policy levers that turn risks into innovation opportunities. Consequently, crop diversification rather than monoculture substitution emerges as the most holistic pathway in leveraging OFSP’s micronutrient edge while retaining cereal protein. By reframing roots and tubers as front-line actors in sustainable food systems, this research invites policymakers, investors, and farmers to harvest a new synthesis involving resilient livelihoods, healthier plates, and a lighter environmental load, all sprouting from a single, orange root.

Keywords: Environmental; Economics; and; Policy (search for similar items in EconPapers)
Pages: 17
Date: 2026-03
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Persistent link: https://EconPapers.repec.org/RePEc:ags:aes026:397908

DOI: 10.22004/ag.econ.397908

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