Footprint Protocol

The OpenGraph Protocol for carbon footprints — embed fp: meta tags on any product page to expose standardized CO₂e data that tools, browsers, and aggregators can read automatically.

<meta property="fp:product" content="Fairphone 5" />
<meta property="fp:co2e" content="23.6" />
<meta property="fp:co2e:unit" content="kg" />
<meta property="fp:scope" content="lifecycle" />
<meta property="fp:methodology" content="ISO 14067" />

Properties

Required

Property	Description	Example
fp:product	Product name	Fairphone 5
fp:co2e	CO₂ equivalent value	23.6
fp:co2e:unit	Unit: kg, g, or t	kg

Recommended

Property	Description	Example
fp:scope	lifecycle, production, use, or disposal	lifecycle
fp:per	Functional unit	unit, year, km
fp:methodology	Standard used	ISO 14067, GHG Protocol
fp:certifier	URL of certifying body	https://cert.example.org
fp:verified:date	ISO 8601 verification date	2025-01-15

Lifecycle breakdown (GHG Protocol phases)

Property	Phase
fp:materials	Raw material extraction and processing
fp:manufacturing	Manufacturing and assembly
fp:transport	Transport and distribution
fp:use	Use phase (energy, consumables)
fp:disposal	End-of-life treatment

Breakdown values use the same unit as fp:co2e:unit.

This repository

footprint/
├── parser/   Rust crate — parse fp: tags from any HTML string or file
└── site/     Astro site — protocol documentation (Cloudflare Pages)

Parser

# Cargo.toml
[dependencies]
footprint-parser = "0.1"

let data = footprint_parser::parse(html)?;
println!("{} emits {} {}", data.product, data.co2e, data.co2e_unit);

CLI

cargo install footprint-parser
footprint product-page.html

Product:   Fairphone 5
CO2e:      23.6 kg
Scope:     lifecycle
Method:    ISO 14067
Verified:  2025-01-15

Lifecycle breakdown (kg):
  Materials:     8.2
  Manufacturing: 4.1
  Transport:     2.8
  Use:           6.9
  Disposal:      1.6

License

MIT