Most sustainability scores are paid for by the companies being rated. It's why Shell holds an “A” from one rating agency and “AA” from another. It's why nearly every major brand can claim to be a sustainability leader, all at once.
We made SINK because the planet deserves a grading system that isn't a marketing exercise. The same rubric for every company. Public data only. No payment, ever, to be scored or to change a score.
We'd rather be corrected than wrong. That's the whole point.
Transparent. Reproducible. Open to challenge.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleIndustry sustainability ceiling. Oil & Gas: 20. SaaS: 75. Fixed per sector — it caps how high a company in that industry can score.
Ten questions, same rubric for everyone. Emissions, targets, governance, offsets, lobbying. Where real effort shows.
Total emissions volume. 50M+ tonnes triggers a 0.60× multiplier. Physics doesn't negotiate — size is part of the score.
Here's how that formula produces Apple's score of 49.
Electronics / Hardware sector ceiling, derived from lifecycle emissions and recyclability benchmarks.
10 rubric questions: emissions targets, Scope 3 disclosure, governance, offsets, lobbying.
Weighted average: base impact has a 30% floor, performance drives 70% of the result.
Apple's 20M+ tonne Scope 3 footprint triggers the multiplier. See methodology §4.
60.3 × 0.82 ≈ 49. Making progress.
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