Walmart scores 3 points higher than Amazon on SINK's sustainability index.
Walmart is more sustainable according to SINK's open sustainability index, scoring 30/100 vs Amazon's 27/100, a difference of 3 points.
Walmart scores 30/100 on the SINK sustainability index (Significant gaps). Walmart's Scope 1 and 2 emissions fell 7.5% in FY2026 but it missed its SBTi-approved 35% cut; Scope 3, about 98% of its footprint, rose about 3% to an estimated 635 Mt. It missed its packaging and waste-diversion goals, paid a $3M FTC penalty in 2022 over false 'bamboo' product claims, and belongs to trade groups that oppose climate policy.
Amazon scores 27/100 on the SINK sustainability index (Significant gaps). Amazon's absolute emissions rose 16% to 80.85 MtCO2e in 2025 despite intensity gains. Scope 3 surged 20% and remains unaudited. No SBTi-validated target exists. The company claims renewable energy matching but operates 15 Mt of fossil-fuel logistics annually. Nature and waste strategies lack absolute reduction commitments.
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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