95% of a retailer’s greenhouse gas emissions are Scope 3, meaning they come from suppliers, manufacturers, and logistics partners outside the retailer’s direct operations. No retailer can reduce their Scope 3 emissions alone. The only path to meaningful Scope 3 reduction runs through supplier relationships, industry coalitions, and sometimes unlikely partnerships with competitors.
This is the specific reason collaboration for sustainable product development isn’t altruism: it’s the only mechanism that works.
The Sustainable Apparel Coalition Model
The Sustainable Apparel Coalition (SAC) formed when Walmart hosted an initial meeting where Patagonia’s founder Yvon Chouinard discussed his business model. The combination of Walmart’s scale and Patagonia’s sustainability credibility created a coalition capable of setting standards that suppliers couldn’t ignore.
The Higg Index (developed by SAC) provides a shared measurement tool for comparing energy efficiency, fabric waste reduction, and sustainable raw material sourcing across brands and their suppliers. When multiple major retailers use the same metric, suppliers face consistent requirements rather than dozens of slightly different standards, which reduces the compliance cost of improvement and creates a genuine “race to the top” dynamic.
This is the pre-competitive collaboration model at its best: competing retailers sharing measurement infrastructure because the environmental problem they’re trying to solve is bigger than their competitive interests in measurement methodology.
The Breakthroughs 2030 Retail campaign extends this: major retailers including Walmart and Best Buy sharing data and providing leadership support for each other’s climate goals. The explicit theory is that collective action reaches targets faster than individual action, because shared supplier networks mean that one retailer’s supplier engagement affects another retailer’s supply chain.
How Supplier Collaboration Actually Works
Walmart’s supplier sustainability program uses a specific tool: calculators that allow suppliers to measure their own carbon footprint, see the effects of reduction scenarios, and identify areas for improvement, then make the case internally for implementing changes. The retailer provides the measurement infrastructure; the supplier does the analysis for their own operational context; the shared data creates accountability.
This is more effective than top-down mandates because suppliers understand their own operations better than their customers do. A mandate that specifies what to change is often less efficient than a measurement system that reveals what would have the most impact.
Carrefour, Metro, Kroger, and Woolworths’ partnership with Loop extends collaboration into the packaging infrastructure layer: sharing the reverse logistics and cleaning systems that none of them could justify building individually.
The hardest part of retail sustainability collaboration isn’t finding shared interests — those are usually clear. It’s getting commercial and operational teams to own sustainability outcomes rather than seeing them as something imposed by a sustainability department. Until sustainability is embedded in daily business decisions rather than housed in a separate function, collaboration will outpace internal execution.
The Technology Layer
Digital supply chain tools are making collaboration more tractable. Advanced point-of-sale systems can now monitor plastic bag use at checkout and reward customers who bring reusable bags: a sustainability measurement integrated directly into the commercial transaction rather than managed separately.
Supply chain digitization platforms enable brands to assess the environmental performance of their products’ ingredients, production processes, and production locations in near real time. This visibility makes collaborative accountability possible: retailers and suppliers can identify problems together before they become crises.
The goal of this technology layer is reducing the information asymmetry between retailers and their supply chains, which is currently the primary barrier to effective sustainability collaboration.
P.S. The Sustainable Apparel Coalition’s membership is open to brands, retailers, manufacturers, and affiliates. Joining before you need the standards protects you from compliance scrambles when standards become purchasing requirements.