Walmart scores 2 points higher than Amazon on SINK's sustainability index.
Walmart is more sustainable according to SINK's open sustainability index, scoring 27/100 vs Amazon's 25/100 — a difference of 2 points.
Walmart scores 27/100 on the SINK sustainability index (Significant gaps). Walmart's sustainability performance is defined by rising absolute emissions despite intensity gains, missed climate targets, and a widening gap between supply chain ambitions and verified delivery. Operations reporting is granular but negative in trajectory. Supply chain engagement lacks rigor, and trade association lobbying contradicts stated climate commitments.
Amazon scores 25/100 on the SINK sustainability index (Significant gaps). Amazon's 29/100 score reflects a company with credible renewable energy matching but crippled by removed SBTi validation, rising absolute emissions (+34.5% since 2019), unverified supply chain reporting, and active greenwashing litigation. The gap between Climate Pledge rhetoric and delivery is structural.
Both companies are rated on the same 10-question SINK rubric: Scope 1/2/3 carbon footprint, energy source, nature and biodiversity, resource use, water, emissions trajectory, science-based targets, transparency, and controversies. Scores are 0–100, based on public data, and fully reproducible.
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