Why Local Sourcing Matters (and When It Doesn't Cut Emissions)
Buying local is a familiar idea in sustainable shopping. Restaurants advertise local suppliers, shops label regional products, and many small businesses say they source nearby whenever they can. But why does sourcing locally matter, and does it really shrink an environmental footprint? The honest answer has two parts: local sourcing offers real advantages, and it is not always the lowest-emission choice.
What does "local" actually mean?
There is no agreed definition. The USDA Economic Research Service notes that there is no consensus on a definition of "local" in terms of the geographic distance between production and consumption. In the United States, one often-quoted statutory definition comes from the Food, Conservation, and Energy Act of 2008. In that Act, a "locally or regionally produced agricultural food product" is one raised, produced and distributed in the locality or region where the final product is marketed, so that the total distance it is transported is less than 400 miles, or one raised, produced and distributed in the State where it is produced (the definition was written for USDA's Business and Industry Guaranteed Loan Program). Other laws draw the boundary differently. As the U.S. Department of Agriculture's National Agricultural Library points out, the Food Safety Modernization Act uses a slightly smaller area: producers located 275 miles or less from their customers, or within the same state.
So when you see "local" on a label, ask what the seller means by it. A farm 30 miles away and a farm 300 miles away may both be called local.
Reasons local sourcing matters
Shorter, simpler relationships
Buying from nearby producers makes it easier to meet them, visit the farm or workshop, and ask questions. For a business, a short chain can mean fewer intermediaries, quicker communication and, potentially, faster replacement if something goes wrong. If you care about knowing where a product comes from, proximity helps you check. It pairs well with the questions covered in our guide to what ethically sourced means.
Money stays in the community
Many buyers choose local suppliers in the hope of supporting nearby businesses and workers. Be cautious about promising an economic effect: the USDA Economic Research Service reports that findings are mixed on the impact of local food systems on local economic development.
Fresher, more seasonal products
For perishable foods, a short trip from field to customer can mean produce that has spent less time in transit, and it encourages attention to what is actually in season.
Resilience
Relying on a single distant supplier can leave a business exposed if shipping is disrupted. A mix of nearby suppliers can add flexibility. Local sourcing is not a complete protection, because local producers can also face bad weather or shortages.
Support for small and traditional producers
Local markets and direct sales can offer small farms and craft producers a route to buyers. The USDA Economic Research Service notes that, for smaller farms, direct marketing to consumers accounts for a higher percentage of sales than it does for larger farms. Cooperative models can make it easier for several small producers to supply a regional buyer together; see our explainer on what a producer cooperative is.
The emissions question: the surprising part
It is natural to assume that fewer miles equals fewer emissions. For food, the evidence is more complicated. A 2018 study by Joseph Poore and Thomas Nemecek, published in Science and described by Our World in Data as the largest meta-analysis of global food systems to date, compared the environmental impact of foods, and Our World in Data, drawing on it, concludes that what you eat is far more important than where your food travelled from. It reports that, for most food products, transport accounts for less than 10% of emissions (it notes that Poore and Nemecek's estimate put transport at 6% of food emissions), and that land use and farm-stage emissions together account for more than 80% of the footprint of most foods.
Two illustrations from the same source help put this in perspective:
- Food type dominates. Our World in Data reports that producing a kilogram of beef emits 60 kilograms of greenhouse gases, while peas emit about 1 kilogram, and that transport makes up just 0.5% of the footprint of beef from beef herds. Switching what you eat can matter more than where it was grown.
- Local is not automatically lower-carbon. Out-of-season local produce may need energy-intensive growing methods such as greenhouses. Our World in Data cites a 2009 study (Hospido et al.) estimating that importing Spanish lettuce to the UK in winter results in three to eight times lower emissions than producing it locally.
There is an important exception. Air freight is a very small share of food miles (0.16%, according to Our World in Data) but emits 50 times more CO2-equivalent than a boat per tonne-kilometre, and Our World in Data advises avoiding air-freighted foods where you can.
These results concern food emissions in particular. For other goods, such as furniture or textiles, the same conclusion should not be assumed. Even for food, the ERS review described the literature as sparse and so far inconclusive about whether localisation reduces energy use or greenhouse gas emissions.
How to source locally in a way that helps
Use local sourcing as one tool among several rather than a rule on its own:
- Choose by season. Local products in their natural growing season avoid the energy-intensive out-of-season growing described above, so they are where the case for local is strongest.
- Prioritise what you buy. If your goal is a lower footprint, the type of product usually matters more than its distance.
- Ask about growing methods. A nearby supplier using energy-intensive greenhouses may have a different footprint from one growing outdoors. Our look at how organic benefits are changing explains why production practices increasingly shape sustainability claims.
- Avoid air-freighted perishables when a seasonal alternative exists.
- Combine goals. A product can be local, seasonal and fairly traded at the same time. Where local options are not available, imports with credible ethical certification can be a reasonable alternative. Our overview of how sourcing is changing for sustainable brands discusses balancing these.
For businesses: a practical checklist
- Define "local" in writing (distance, state or region) and use the same definition everywhere you advertise it.
- Keep supplier records so that a "locally sourced" claim can be backed up.
- Don't present local sourcing as a climate guarantee; describe it as the benefits you can support, such as freshness, supplier relationships and community links.
- Review the claim periodically, since suppliers and seasons change.
Bottom line
Local sourcing matters because it shortens relationships, keeps trade close to home, can open a route to buyers for small producers and can add resilience. It does not automatically lower emissions, and for food the evidence summarised here points to what you eat as a bigger factor than how far it travels. The strongest approach pairs local sourcing with seasonality, honest labelling and good production methods.
This article is general information only and is not environmental, legal or business advice.
Sources
- Our World in Data, "You want to reduce the carbon footprint of your food? Focus on what you eat, not whether your food is local" (summarising Poore & Nemecek, 2018): https://ourworldindata.org/food-choice-vs-eating-local
- Congressional Research Service, U.S. Farm Policy: Local and Regional Food Systems (2008 Farm Bill definition wording): https://www.everycrsreport.com/reports/IF10232.html
- National Agricultural Library (USDA), What Makes a Food "Local?" (400-mile and 275-mile definitions): https://www.nal.usda.gov/exhibits/ipd/localfoods/exhibits/show/food-locality/local-distance
- USDA Economic Research Service, Local Food Systems: Concepts, Impacts, and Issues (ERR-97, 2010): https://ers.usda.gov/publications/46395
