Salmon Swap Cuts Food Emissions by 28%, Study Finds

Researchers at University of Bristol and University of Southampton modeled UK diets and found that swapping one beef steak for salmon would cut carbon emissions 28% by 2050, matching a London-Marrakech round-trip flight.

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Food production accounts for 20% of UK greenhouse-gas emissions, with livestock generating the majority of food-sector emissions. The 2050 net-zero goal drives dietary research. The study evaluated five scenarios: Business-as-usual (15% cut, London-Madrid flight), REDUCE (39% cut, Cyprus flight), NHS Eatwell (42% cut, Tel Aviv flight), Planetary Health (49% cut, Baku flight), and the salmon swap, which alone reduces emissions by 28%—equivalent to a London-Marrakech round-trip flight and 7.30 kg CO2 per person weekly (? 16 lb).

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Lead author Dr. Jenny Baverstock stresses that modest diet shifts and NHS Eatwell guidance can produce “important reductions in carbon emissions that are necessary for environmental sustainability.” Professor Guy Poppy adds that concern about planetary health could drive adoption, but notes trade volatility creates need for protein security. The authors acknowledge that dietary change is difficult, requiring policy support for livestock farmers, sustainable expansion of the fishing sector, and measures to raise seafood consumption, which sits 31% below recommendations. Ongoing trade-tariff shifts could affect beef and salmon prices, complicating uptake.

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The model assumes the weekly swap will be adopted but does not estimate consumer uptake, cost implications, or the environmental impact of scaling UK salmon production. The research team recommends that UK policymakers assess domestic fish supply chains to improve protein security and that further studies evaluate incentives for consumers and producers to enable the salmon swap at national scale.

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"Taking forward simple changes in our diets and also following existing recommendations from the NHS Eatwell guide could see important reductions in carbon emissions that are necessary for environmental sustainability. Our simple swap offers a nutritional/health advantage as well as an environmental one which is ideal as these two need to go hand in hand and not be traded off against each other." — Dr. Jenny Baverstock, Honorary Research Fellow, University of Bristol

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"Given the public concern about planetary health this substitution of salmon for beef may gain traction with the public if, as well as promoting individual health there is more awareness around eating more sustainably. This offers an easy choice for people whom want to reduce their environmental footprint. In 2026, we face unprecedented trade challenges with the turbulence of the trade tariffs levied by the US and counter responses globally which raise questions around national food security and the role of a global food system." — Professor Guy Poppy, Pro Vice-Chancellor for Research and Innovation, University of Bristol

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