# Reports

Markdown version of https://bluegreenmaterials.com/en/reports. Updated on 2026-11-08.

Selling scrap through Bluegreen leaves paperwork that is useful: for the accountant, the auditor and the sustainability team. Here is every document you receive, with an example, and the public guide we prepared on steel recycling in Mexico.

## What you receive for each lot

- **Environmental impact certificate** (Per lot): Estimated avoided emissions with the real net weight of the lot, the factor version used and its sources. With a folio and a public verification page.
- **Purchase CFDI** (Per lot): The tax invoice for the transaction, with any applicable withholdings, ready for your accounts.
- **Carta Porte** (Per lot): The transport supplement for moving the material from the generator's yard to the mill.
- **Scale ticket** (Per lot): The weight with folio, date, time and photo. The basis for settlement and for the certificate.
- **Chain of custody** (Per lot): Handover records signed by each party, with the time they were signed, from pickup to the plant.
- **Consolidated sustainability report** (Periodic): For recurring clients: tonnes, materials and avoided emissions by period and by plant, with the list of certificates behind it.

## Sample certificate

This is how an impact certificate reads. The data is an example and does not belong to any client.

**Certificate fields, with illustrative data**

| Field | What it contains | Example |
| --- | --- | --- |
| Folio | Unique, verifiable certificate identifier | BG-2026-000142 |
| Generator | Legal name and tax ID of whoever sold the material | Example Company, S.A. de C.V. |
| Material | Family and grade of each item in the lot | Carbon steel, HMS 1 |
| Net weight | Real scale weight, in kilograms | 18,420 kg |
| Date | Day the lot was paid | November 12, 2026 |
| Avoided emissions | Net tonnes times the factor of each family | Per the current factors |
| Factor version | Which factor set was used, and whether it is preliminary | v0.1, preliminary |
| Sources | Publications the factors come from | List of sources with links |
| Verification | Link and code to check the document without an account | Public page for the folio |

> The full calculation, its rules and its limits are in the [impact methodology](https://bluegreenmaterials.com/en/impact-methodology).

## Who uses each document

| Who | What they use | What for |
| --- | --- | --- |
| Accounting | CFDI and settlement statement | Record the income and withholdings |
| Tax compliance | CFDI, Carta Porte and scale ticket | Prove the transaction to the tax authority if reviewed. See [regulation](https://bluegreenmaterials.com/en/regulation) |
| Environmental | Chain of custody and final destination | Prove the waste reached a formal recycler |
| Sustainability | Certificates and consolidated report | Report avoided emissions separately, as the GHG Protocol asks[^ghg-scope3] |
| Audit | Verification page for each folio | Check that the document is authentic |

## Guide: steel recycling in Mexico

A summary with public data, for anyone who needs the context on one page.

- **13.5 Mt**: of crude steel produced in Mexico in 2025[^ws-figures]
- **95.9%**: was made in electric arc furnaces, which melt mostly scrap[^ws-figures]
- **30.3%**: is the electric furnace share worldwide[^ws-figures]
- **0.69 t**: of CO₂ per tonne for scrap based steel, against 2.34 t for the ore route[^ws-indicators]

- **Mexico runs on scrap.** With almost all its steel made in electric furnaces, scrap is its main steelmaking raw material[^ws-figures]. See [how steel is made](https://bluegreenmaterials.com/en/steel).
- **Trade both ways.** In 2025 Mexico exported 1.6 million tonnes of ferrous scrap and imported 1.4 million[^ws-figures].
- **Quality rules.** Copper and tin cannot be removed in the furnace; clean, well graded scrap is worth more and lets mills use more scrap[^daehn-cu].
- **Formality.** Every sale carries a CFDI and every federal highway move carries a Carta Porte. See [the applicable regulation](https://bluegreenmaterials.com/en/regulation).
- **Measurable impact.** The scrap route emits less than a third of the CO₂ per tonne of the ore route[^ws-indicators]. See [the environmental impact](https://bluegreenmaterials.com/en/impact).

## Frequently asked questions

### When do I get the certificate?

When the lot is paid, because that is when the real net weight is closed.

### Can I get a report per plant or per year?

Yes. Recurring clients receive a consolidated report per period and, if they have several plants, split by plant.

### Can the certificate be used as a carbon credit?

No. It is a documented estimate of avoided emissions for your sustainability report, not a tradable instrument.

## Sources

[^ghg-scope3]: GHG Protocol (WRI and WBCSD), «Technical Guidance for Calculating Scope 3 Emissions, version 1.0, category 5» (2013). https://ghgprotocol.org/sites/default/files/2023-03/Scope3_Calculation_Guidance_0%5B1%5D.pdf
[^ws-figures]: World Steel Association (worldsteel), «World Steel in Figures 2026» (2026). https://worldsteel.org/wp-content/uploads/World-Steel-in-Figures-2026.pdf
[^ws-indicators]: World Steel Association (worldsteel), «Sustainability Indicators Report 2025» (2025). https://worldsteel.org/wider-sustainability/sustainability-indicators/sustainability-indicators-report-2025/
[^daehn-cu]: Environmental Science & Technology (ACS), «Daehn, Cabrera Serrenho and Allwood, How Will Copper Contamination Constrain Future Global Steel Recycling?, 51(11):6599 a 6606» (2017). https://pubmed.ncbi.nlm.nih.gov/28445647/