Every SINK score is produced by the same formula, using the same rubric, applied to publicly available data. No exceptions. No special treatment. This page explains exactly how it works so you can verify any score yourself.
SINK is a physics-first environmental impact score. We measure what the planet physically experiences — absolute emissions, ecosystem damage, resource depletion, water impact — not reporting maturity or corporate process. Scores are independent assessments open to challenge and correction by anyone with evidence.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleA fixed score representing the sustainability ceiling of an industry based on its physical impact on the planet. Oil & Gas scores 20 because the core business is extracting fossil fuels. SaaS scores 70 because software has a fundamentally lower environmental footprint. Financial Services scores 50 because the planet experiences what banks finance, not just their office emissions.
Ten questions, each scored 0–10, measuring real environmental impact across carbon, energy, nature, water, resources, and accountability. A company with low physical impact and basic evidence will score higher than one with polished reporting but a massive footprint. Operational evidence (energy bills, supplier records) is accepted alongside formal sustainability reporting.
Total emissions volume determines a multiplier between 0.60x and 1.00x. A company emitting 50 million tonnes of CO₂e per year has its score reduced by 40% — because scale matters. Physics doesn't care about percentages. The planet experiences absolute tonnes, not relative improvement.
Every company is assessed against these ten questions. The first seven measure physical impact — what the planet actually experiences. The last three measure whether the company is improving and can be held accountable. Performance = sum of all ten scores.
Scores between anchors (0, 3, 6, 10) reflect how closely a company meets the next threshold. Operational evidence (energy bills, supplier records, water bills) is accepted at all levels — formal sustainability reporting is not required to score well.
Each industry gets a base score reflecting the physical environmental impact of its core business activity. Click any row to see the rationale. All scores are open to challenge.
New sectors added as companies are scored. Base scores set by editorial review and open to challenge with evidence.
Theoretical near-maximum. Requires exceptional performance across all dimensions at scale.
Best-in-class. Only a handful of companies in our database have reached this level.
Genuine sustainability leadership backed by verified data and science-based targets.
Meaningful effort with room for improvement.
Some action but significant gaps remain.
Major disclosure or performance deficiencies.
Minimal effort or actively harmful practices.
We don't grade on a curve. We grade against the planet. Scores above 75 are exceptionally rare — reflecting how demanding the rubric is. The majority of companies score between 30 and 60. A score of 60+ represents genuine sustainability leadership, the kind backed by verified data, science-based targets, and transparent governance.
A separate designation for companies whose core business demonstrably removes more greenhouse gas than it creates. The badge is displayed alongside the SINK score — it does not change the score itself.
Eligibility requires all three:
Companies cannot pay to receive this designation.
Scored using publicly available data. Awaiting community verification.
At least 5 community verifications across the 10 questions, with fewer than 3 open challenges. Each verification must include a source URL or brief justification.
At least 20 community verifications, fewer than 2 unresolved challenges, and score stable for 30+ days.
Every question on every score has a “Challenge” button. Click it, select the tier you think is correct, provide your evidence — a source URL is required — and submit.
Challenges are published publicly. When community evidence supports a more accurate assessment, the score is updated, the challenger is credited, and the change is logged permanently in the score history. No score is final.
We'd rather be corrected than wrong. That's the point.
Major rubric overhaul: physics-first methodology. Questions now measure what the planet physically experiences, not reporting maturity.
Rubric restructured from 10 reporting-focused questions to 10 impact-focused questions: 7 measuring physical impact (carbon, energy, nature, resources, water) and 3 measuring accountability.
New questions added: Nature & Biodiversity Impact (Q5) and Water Impact (Q7).
Offsets folded into Targets & Commitments (Q8). Governance folded into Transparency & Accountability (Q9). Lobbying folded into Controversies & Red Flags (Q10).
SME-accessible scoring: operational evidence (energy bills, supplier records, water bills) now accepted at all levels. Companies are scored on physical impact, not reporting sophistication.
Base impact revisions: Financial Services 65→50 (financed emissions), Healthcare 55→45 (chemical manufacturing, water pollution), Construction 40→35 (concrete, embodied carbon), Meat/Dairy 35→30 (methane, deforestation), Fast Fashion 20→15 (water pollution, microplastics, waste).
New industry categories added: Renewable Energy (75), Consulting / Professional Services (65), Energy Supply / Utilities (55), Hospitality / Hotels (45), Food Service / Restaurants (45), E-commerce / Online Retail (40), Ride-hailing / Mobility Platforms (30).
All existing companies rescored under v2.0 rubric.
Published rationale for every base impact score. SaaS revised 75→70, Electronics 45→40, Apparel (Durable) 25→30. Added interpolation note and verification source requirements.
Formula, 10-question rubric, base impact table, scale penalties, scoring bands, verification tiers, and challenge process.