Our "Stern & Fair" Standards
In a world of greenwashing, Hummlan.com provides clarity. Our rating system isn't based on brand marketing—it's based on the backbone of EU Taxonomy and CSRD.
Framework Backbone
For full transparency, we publish the two frameworks that power our rating logic.
Why we are "Stern"
- Tier 1 Evidence Only: We only give points for third-party audited certifications. Self-reported claims from brands score zero.
- No Partial Credit: If a brand can't prove it, we don't assume it. "Working towards" isn't the same as "Doing".
- DNSH Enforcement: We apply the "Do No Significant Harm" principle. Excellence in one area doesn't excuse failure in another.
Why we are "Fair"
- Context Matters: We recognize industry constraints. Sustainable dairy has different challenges than organic cotton.
- Transparent Logic: Every score breakdown is public. We show exactly why a brand was docked points.
- Open for Appeals: Brands can submit new third-party evidence at any time to improve their score.
Why "Hummlan"?
Masters of "Buzz Pollination"
Bumblebees vibrate at a specific frequency to dislodge hidden pollen other bees can't reach. Just as they go deeper, Hummlan’s "stern and fair" rating system cuts through greenwashing to uncover the absolute truth about a brand's sustainability.
Keystone Pollinators
As a keystone species, bumblebees support entire ecosystems. We follow the EU Taxonomy to look at systemic, holistic impact—ensuring the products we recommend protect the very foundation of our planet's biodiversity.
Resilience in Harsh Climates
Bumblebees thrive in harsh conditions where others cannot. Genuine sustainability isn't a fair-weather commitment; our ratings remain strict and unyielding, weathering the harsh reality of climate accountability.
Hyper-Efficient Foragers
Highly selective and efficient, bumblebees visit up to 30 flowers per minute. Hummlan mirrors this by filtering out greenwashed products, doing the rigorous foraging so you get only high-integrity, cost-effective options.
How the Hummlan Sustainability Score Works
The Hummlan Sustainability Score (HSS) is a rigorous, evidence-based rating system that evaluates consumer products and brands across five environmental and social pillars. Unlike qualitative “eco” labels or self-reported brand ratings, HSS applies a stern but fair framework grounded in two established regulatory standards:
EU Taxonomy
Regulation (2020/852) — the EU’s classification system for environmentally sustainable economic activities. Provides the what: defines six environmental objectives that qualify as sustainable.
CSRD
Corporate Sustainability Reporting Directive (2022/2464) — the EU’s framework for mandatory sustainability disclosure. Provides the how: defines evidence standards and disclosure quality.
This dual-anchor approach means HSS is legally grounded, audit-compatible, and defensible against greenwashing challenges. Every score you see on Hummlan is backed by verifiable evidence, not marketing claims.
Core Principles
Stern: Evidence over Storytelling
- Tier 1 Evidence Only: Third-party audited certifications score full points. Self-reported claims from brands score zero without supporting data.
- No Partial Credit: If a brand cannot prove it, we do not assume it. “Working towards” is not the same as “doing.”
- DNSH Enforcement: We apply the “Do No Significant Harm” principle from the EU Taxonomy. Excellence in one area does not excuse failure in another.
Fair: Context & Progress Matter
- Context Matters: We recognize industry constraints. Sustainable dairy has different challenges than organic cotton, and our scoring reflects that.
- Transparent Logic: Every score breakdown is public. We show exactly why a brand was docked points and what evidence would improve their score.
- Open for Appeals: Brands can submit new third-party evidence at any time. We review within 30 days and publish score changes with a changelog.
The 5 Pillars of HSS
Every brand and product in our database is assessed across five pillars, each mapped to a specific EU Taxonomy objective and CSRD disclosure standard. The pillars cover the full product lifecycle — from raw material extraction through manufacturing, use, and disposal.
Climate Impact
Weight: 20% · Article 10 — Climate Change Mitigation
Measures a brand's commitment to reducing greenhouse gas emissions across its entire value chain — from raw material extraction to product disposal.
The Stern Reality
Tackling the climate crisis requires absolute reductions in greenhouse gas emissions, not just purchasing carbon offsets or planting trees while continuing business as usual. We do not award points for "net-zero by 2050" pledges without credible interim targets.
Scoring Criteria
SBTi-aligned targets verified, annual Scope 1-2-3 emissions reported, 100% renewable energy in operations, year-over-year absolute reductions demonstrated.
Published emissions data with some Scope 3 coverage, active renewable energy procurement, near-term reduction targets set.
Self-reported emissions claims without third-party verification, limited renewable energy use, targets disclosed but not SBTi-validated.
No public emissions data, no reduction targets, no renewable energy disclosure, or reliance on offsets without reduction commitments.
Excels
Patagonia: Achieves 96/100 on Climate Impact. SBTi-aligned targets, annual Scope 1-2-3 reporting through CDP disclosure, 100% renewable energy across operations, and absolute emission reductions of 87% since the 1990s.
Fails
Fast fashion giants: Brands that announce "carbon neutral" collections while simultaneously increasing total output and relying on fossil-fuel-powered manufacturing in countries with weak environmental regulations. Offsetting without reducing is not a climate strategy.
Circular Economy
Weight: 20% · Article 13 — Transition to a Circular Economy
Evaluates how a brand designs out waste — from material sourcing and product durability to repair services and end-of-life recovery systems.
The Stern Reality
We cannot extract our way to a sustainable future. Using 10% recycled plastic in a single-use bottle is not circularity — it is a band-aid. We demand systemic design changes that eliminate waste at the source.
Scoring Criteria
Comprehensive repair program with published guides, take-back or resale scheme, zero-waste or plastic-free packaging, mono-material design enabling recyclability, published durability guarantees.
Refill or reuse options available for key products, majority of packaging is recyclable, products designed for durability with customer longevity data published.
Standard recyclable packaging only, some recycled content in materials, no repair or take-back program offered.
Single-use or non-recyclable packaging, planned obsolescence evident in product design, no end-of-life management system.
Excels
Nudie Jeans: Achieves 97/100 on Circular Economy. Free repairs offered at any Nudie store worldwide, a thriving pre-owned denim marketplace, and mono-material 100% cotton denim that is fully recyclable. Their repair program has fixed over 100,000 pairs of jeans.
Fails
Tech companies: Brands that use proprietary screws, waterproof glue, and non-replaceable batteries to make repairs impossible, forcing consumers to buy entirely new devices when a single component fails. Planned obsolescence is the opposite of circularity.
Pollution Prevention
Weight: 15% · Article 14 — Pollution Prevention & Control
Assesses a brand's management of toxic chemicals, microplastics, and hazardous substances across its manufacturing process and final product.
The Stern Reality
Toxicity in our air, water, and soil affects human health and devastates ecosystems. We have a zero-tolerance policy for "forever chemicals" (PFAS) and known carcinogens. Safe chemistry is non-negotiable.
Scoring Criteria
Multiple rigorous chemical safety certifications (MADE SAFE + Cradle to Cradle + EPA Safer Choice), full ingredient transparency with no proprietary secrecy, zero-discharge wastewater treatment, PFAS-free across all products.
At least one rigorous chemical safety certification (EWG Verified, MADE SAFE, or equivalent), comprehensive ingredient disclosure, active microplastic mitigation program.
Self-reported "non-toxic" or "eco-friendly" claims without third-party certification, partial ingredient disclosure only.
No chemical safety disclosure, known use of PFAS or other hazardous substances, no wastewater treatment data published.
Excels
Acure: Achieves 88/100 on Pollution Prevention. EWG Verified with an "A" rating across their entire product line, COSMOS Organic certified, 100% vegan, paraben-free, sulfate-free, and mineral oil-free. Proves that safe chemistry does not have to be a luxury.
Fails
Conventional activewear brands: Brands that rely on PFAS-based waterproofing or stain-resistant treatments, contaminating water supplies during both manufacturing and home washing. The same chemicals linked to cancer, immune suppression, and environmental persistence.
Supply Chain & Social
Weight: 20% · CSRD ESRS S1 — Own Workforce
Audits a brand's treatment of workers across its entire supply chain — from fair wages and safe conditions to transparency about who makes the products.
The Stern Reality
A product cannot be sustainable if it is made through the exploitation of workers. Environmental justice and social justice are inextricably linked. A brand cannot hide behind a complex supply chain.
Scoring Criteria
Fair Trade Certified across core products, published factory list with public audit scores, third-party verified living wage commitment, strong worker grievance mechanisms.
B Corp certification with social pillar score of 80+, published factory list (even if partial), active supplier code of conduct with audit program.
Self-reported ethical sourcing policy, generic supplier code of conduct, no third-party audits or published enforcement results.
No supply chain disclosure, no published factory list, no evidence of labor audits, or documented labor violations without remediation.
Excels
Dr. Bronner's: Achieves 98/100 on Supply Chain & Social. Pioneers in Fair Trade for over 18 years with verified living wages across their entire supply chain. They publish detailed supplier lists, maintain long-term relationships with farming cooperatives, and reinvest profits into community development projects.
Fails
E-commerce fast fashion: Brands that utilize opaque webs of subcontractors, making it impossible to trace the origin of their products. Without transparency, there is no accountability for low wages, unsafe conditions, or child labour.
Biodiversity & Sourcing
Weight: 15% · Article 15 — Protection & Restoration of Biodiversity
Evaluates a brand's impact on ecosystems — from raw material sourcing and deforestation-free supply chains to regenerative agriculture and water stewardship.
The Stern Reality
We are facing a mass extinction event driven largely by habitat destruction for agriculture and resource extraction. Protecting our carbon sinks — forests, wetlands, and soils — is as vital as reducing emissions.
Scoring Criteria
Regenerative Organic Certified (ROC) or equivalent, deforestation-free supply chain with third-party verification for all high-risk commodities, published biodiversity impact assessment, water stewardship certification.
USDA Organic or equivalent certification across key ingredients, sustainable sourcing policy for high-risk commodities (palm oil, soy, cocoa, cotton), FSC-certified packaging.
Self-reported sustainable sourcing claims, some organic ingredients, no comprehensive biodiversity or deforestation policy.
No sourcing disclosure, known use of commodities linked to deforestation, no certification for high-risk materials.
Excels
Frontier Co-op: Achieves 92/100 on Biodiversity & Sourcing. Farmer-owned cooperative that works directly with small-scale farmers to implement regenerative organic practices. Supplies are sourced through Fair Trade relationships that enrich soil health, protect pollinators, and preserve surrounding ecosystems.
Fails
Uncertified palm oil users: Food or cosmetic brands that rely on cheap, uncertified palm oil sourced from recently cleared rainforest in Southeast Asia, directly contributing to the habitat loss of orangutans, tigers, and countless other species.
Evidence Confidence Score (10%)
Beyond the five substantive pillars, we also assess how well a brand backs up its claims. This 10% component reflects the quality, accessibility, and completeness of a brand's sustainability disclosure — separate from what the disclosure actually says. A brand can have good sustainability practices but score poorly on transparency if it hides its data behind paywalls or vague language.
Data Accessibility
- Public sustainability report with clear methodology
- Downloadable data, not just marketing PDFs
- Certification registry links (not just logos)
Data Completeness
- All 5 pillars addressed, not just cherry-picked metrics
- Scope 1-2-3 emissions, not just Scope 1
- Multi-year data for trend analysis
Third-Party Verification
- Audited sustainability report (not just compiled)
- Certifications from recognized, accredited bodies
- CDP or TCFD disclosure with third-party scoring
Why this matters:A brand that publishes glossy marketing claims without raw data is hiding something. The Evidence Confidence Score ensures brands can’t score well on substance without also being transparent about howthey arrived at their claims. It’s the “trust but verify” layer of HSS.
Evidence Tier System
The quality of evidence determines how much weight a brand’s claims carry. We never take a brand’s word at face value. Every pillar score is multiplied by an evidence tier coefficient that reflects the reliability of the supporting data.
| Tier | Multiplier | Meaning | Examples |
|---|---|---|---|
| Tier 1 | 1.0x | Third-party audited certification — full credit given | GOTS, B Corp, Fair Trade, MADE SAFE, Cradle to Cradle, Bluesign, EU Ecolabel, USDA Organic |
| Tier 2 | 0.75x | Self-reported with public, verifiable data — partial credit | Published sustainability report, public factory list, online ingredient disclosure, CDP disclosure |
| Tier 3 | 0.5x | Self-reported without supporting data — limited credit | Website claims, marketing materials, press releases, social media posts |
| Tier 4 | 0x | No evidence available — score capped at 30/100 | No certifications, no reports, no public disclosure on any pillar |
Why this matters: A brand with impressive marketing but no third-party certifications will score significantly lower than a brand with modest but verified claims. This is how we separate genuine sustainability from greenwashing.
Where the Data Comes From
Every HSS score is built on specific, verifiable data sources. We do not accept marketing claims, brand storytelling, or unverifiable “eco-friendly” labels. Here are the certifications and disclosure types we treat as credible evidence:
Climate & Energy
- SBTi (Science Based Targets initiative)
- CDP Climate Disclosure
- Climate Neutral Certified
- RE100 (renewable energy commitment)
- Carbon Trust Standard
- Annual Scope 1-2-3 emissions reports
Circular Economy
- Cradle to Cradle Certified
- FSC (Forest Stewardship Council)
- OK Compost / TUV Austria
- Public repair program data
- Take-back / resale scheme data
- Packaging composition disclosures
Pollution & Chemistry
- Bluesign approved
- OEKO-TEX Standard 100
- EWG Verified / Skin Deep
- MADE SAFE certified
- ZDHC (Zero Discharge Hazardous Chemicals)
- EPA Safer Choice
Social & Supply Chain
- Fair Trade Certified
- B Corp certification
- SA8000 (social accountability)
- Leaping Bunny (cruelty-free)
- PETA Beauty Without Bunnies
- Published factory list with audit scores
Sourcing & Biodiversity
- USDA Organic / GOTS
- Regenerative Organic Certified (ROC)
- Rainforest Alliance certified
- RSPO (sustainable palm oil)
- COSMOS Organic / Natural
- NATrue certified
Public Disclosures
- Annual sustainability / ESG reports
- TCFD / TNFD disclosures
- EU Taxonomy eligibility reports
- CSRD / ESRS reports
- SEC climate disclosure filings
- Product ingredient / material lists
Our research process:Our team actively monitors certification registries, corporate sustainability reports, and regulatory databases. If a brand’s certification expires or a controversy emerges, we update the score — you don’t need to tell us. We also accept submissions from brands with new verifiable evidence.
How Scores Are Calculated
The Formula
Pillar Score = Evidence_Score × Evidence_Multiplier
× Category_Weight
HSS = Σ(Pillar_1 through Pillar_5)
Evidence_Score: 0–100 based on the rubric criteria for each pillar.
Evidence_Multiplier: 1.0 (Tier 1) / 0.75 (Tier 2) / 0.5 (Tier 3) / 0 (Tier 4, capped at 30).
Category_Weight: Default 20% per pillar, adjusted for materiality per product category.
Category Weight Adjustments
Certain product categories have different environmental materiality. We adjust weights to reflect what matters most:
| Category | Adjustment | Rationale |
|---|---|---|
| Food & Beverage | Biodiversity +5%, Climate −5% | Sourcing and land use are more material |
| Electronics | Pollution +5%, Circular −5% | Toxicity and conflict minerals are critical |
| Fashion | Supply Chain +5%, Climate −5% | Labour practices are highly material |
HSS Score Scale
| Range | Rating | Meaning |
|---|---|---|
| 90–100 | ★★★★★ Excellent | Verifiable evidence across all 5 pillars. Industry-leading performance. |
| 75–89 | ★★★★☆ Very Good | Strong evidence in most pillars. Credible performer with some gaps. |
| 60–74 | ★★★☆☆ Moderate | Partial evidence. Some certifications but significant gaps remain. |
| 40–59 | ★★☆☆☆ Weak | Self-reported claims only. Insufficient third-party verification. |
| Below 40 | ★☆☆☆☆ Poor | Minimal or no verifiable evidence. High risk of greenwashing. |
How We Detect Greenwashing
Greenwashing — when a brand exaggerates or fabricates its environmental credentials — is the single biggest obstacle to honest sustainable shopping. HSS is specifically designed to detect and penalise it. Here’s how:
The DNSH Principle
Borrowed from the EU Taxonomy: “Do No Significant Harm.” A brand cannot score highly overall by excelling in one pillar while ignoring others. A clothing brand that uses organic cotton (good for Biodiversity) but pays factory workers poverty wages (bad for Supply Chain) will be heavily penalised. Excellence in one area does not excuse failure in another.
No Partial Credit
If a brand cannot prove a claim with third-party evidence, we score it as zero for that criterion. “Working towards” carbon neutrality, “committed to” fair wages, and “aiming for” zero waste all receive no points. Intent without verifiable action is not sustainability — it is marketing.
Claim vs. Reality Audit
We compare every marketing claim against the underlying evidence. “100% recycled packaging” requires a certification, not just a label. “Carbon neutral” requires SBTi-aligned reduction targets, not just offset purchases. Vague terms like “eco-friendly,” “green,” and “natural” receive zero credit unless backed by a specific certification.
Real-world example:A major fashion brand recently claimed “carbon neutral collection” based on purchased offsets. Our audit found: (1) no reduction in their actual emissions, (2) the offsets were from a non-additional project, and (3) they had no SBTi targets. Result: the “carbon neutral” claim contributed zero points to their Climate Impact score. Marketing claims are not evidence.
Sample Assessments
To illustrate how HSS works in practice, here are three real assessments from our database — spanning high, medium, and moderate scores.
Patagonia
95Only major outdoor brand meeting all EU Taxonomy DNSH criteria across all pillars. Worn Wear repair program, SBTi-aligned targets, Fair Trade Certified sewing, and NetPlus recycled fishing nets set the industry gold standard.
Pact Organic
79Strong social and chemical management via GOTS and Fair Trade certifications. Docked for lacking circular economy programs (no repair or take-back) and relying on carbon offsets rather than absolute emission reductions.
Seventh Generation
70Largest eco-household brand with excellent formulation standards (EPA Safer Choice). Docked for limited circular economy programs (standard plastic bottles, no refill system) and ownership by Unilever, which introduces governance concerns.
Quality Assurance & Review
Rating Cadence
- Full reassessment: Annual review cycle
- Score adjustment: As needed for new certifications, major disclosures, or controversies
- Price update: Quarterly tracking of market prices
Controversy Protocol
- Flag: Issue identified by internal team or external submission
- Verify: Source verification against official records
- Adjust: Score adjusted downward (5–30 point reduction depending on severity)
- Publish: Updated score published with rationale and changelog
Appeals Process
Brands may appeal their HSS rating by submitting new evidence:
- Must include verifiable third-party evidence
- Review within 30 days of submission
- Score changes published with public changelog
Limitations & Transparency
We believe radical transparency includes being honest about what HSS cannot measure. Every rating system has limitations, and we want you to understand ours.
What We Don’t Rate
- Product carbon footprint: We rate brands, not individual product footprints. Two products from the same brand may differ, but we assess the brand’s overall system and policies.
- Animal welfare: While cruelty-free certifications (Leaping Bunny) are included in our Pollution Prevention and Supply Chain pillars, we do not have a dedicated animal welfare pillar.
- Nutritional or health claims: HSS assesses environmental and social sustainability only. A product can be highly sustainable and unhealthy, or healthy and unsustainable.
- Local vs. global: We do not automatically score local products higher. “Local” is not a sustainability certification — it is a claim that requires evidence.
How We Stay Current
- Quarterly updates: Scores are reviewed and updated every quarter. Prices are updated more frequently.
- Controversy monitoring: We track news, regulatory actions, and NGO reports for any brand in our database. Substantiated controversies trigger immediate score adjustments.
- Brand appeals: Brands can submit new third-party evidence at any time. We review within 30 days and publish all score changes with a public changelog.
- Methodology versioning: When our methodology improves, we re-score all affected brands and publish a changelog. You can always see which version of HSS was used for a given score.
Our commitment: We will never accept payment from a brand to change a score. Our rating team and our commercial team are strictly separated. Affiliate commissions do not influence ratings — we link to the cheapest store regardless of commission rate. If you see something wrong, email us athello@hummlan.com.
How HSS Differs from Other Rating Systems
| System | Key Difference with HSS |
|---|---|
| Good On You | Qualitative, no EU Taxonomy or CSRD basis; focuses on fashion only |
| HowGood | Food-focused, no consumer-facing score with regulatory backbone |
| B Corp Assessment | Corporate-level only, not product-specific; no evidence tier weighting |
| EU Energy Label | Single metric (energy), no multi-pillar assessment |
| Cradle to Cradle | Material health focus only, no social or climate pillars |
A Note on Affiliate Links
Hummlan earns commissions through affiliate marketing. However, our rating team and our marketing team are strictly separated. A brand cannot pay for a better score. We link to the cheapest store regardless of the commission rate to ensure you get the best deal on the best products.