J Sainsbury scores 12 points higher than Tesco on SINK's sustainability index.
J Sainsbury is more sustainable according to SINK's open sustainability index, scoring 45/100 vs Tesco's 33/100 — a difference of 12 points.
Tesco scores 33/100 on the SINK sustainability index (Below expectations). Tesco has achieved genuine operational decarbonization (65% Scope 1&2 reduction since 2015) and secured 100% renewable electricity via large corporate PPAs. However, Scope 3 emissions—representing 90% of its footprint—remain flat since 2020. Material supply chain failures include documented Amazon deforestation via Cargill soy and River Wye pollution from intensive chicken farming, both breaching stated commitments.
J Sainsbury scores 45/100 on the SINK sustainability index (Below expectations). Sainsbury's has cut operational emissions 52.8% since 2018 and switched to 100% renewable electricity, backed by SBTi validation. Scope 3 accountability lags: while targets exist, absolute reduction evidence is sparse. A 2019 deforestation link and unresolved supply chain traceability remain material weaknesses.
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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