Microsoft scores 12 points higher than Amazon on SINK's sustainability index.
Microsoft is more sustainable according to SINK's open sustainability index, scoring 39/100 vs Amazon's 27/100, a difference of 12 points.
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.
Microsoft scores 39/100 on the SINK sustainability index (Below expectations). Microsoft's emissions rose 25% in FY2025 to 21.1 Mt CO2e, driven by data-centre construction: capital-goods emissions rose from 5.6 Mt to 9.0 Mt and Scope 3 is 86% of the total. It reports 100% renewable electricity matching, but As You Sow reports it holds nearly 60% of oil and gas cloud contracts, two of which exceed its entire footprint. The SBTi removed its net-zero commitment, and its plan relies heavily on carbon removal.
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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