Cairn
Cairn v1.1.0·Phase 4Cairn turns scattered official climate data into an auditable, queryable benchmark. It answers, per sector: "how do your emissions compare to the sector average?" — and every figure traces back to a versioned, pinned official source.
NL emissions, latest CBS year
▲ 2024 year
NL ETS installations benchmarked
▲ 2023 year
The two benchmarks
Cairn pairs two official sources that answer the question at two altitudes — the whole-economy denominator and the installation-level numerator.
Sector benchmark — CBS →
Greenhouse-gas emissions per NACE section and year, with each sector's share of
the national total. The whole-economy sector average, from CBS StatLine table
85669NED (IPCC method, annual).
Installation benchmark — EU ETS →
Per NL stationary installation, its verified emissions versus its NACE-section peers. The large-emitter benchmark, from euets.info (the reprocessed EU Transaction Log), cross-checked against the EEA Union Registry aggregate.
Why it is auditable
Cairn is built on a few load-bearing rules, so a number can never drift away from its source:
- Raw data is immutable — every ingest writes a new, versioned path.
- The manifest is append-only — each source pins its exact release by
sha256; a data change without a manifest change is impossible. - Mappings are code — the CBS category → NACE mapping is a reviewed seed, so its numeric impact shows up in a CI diff.
- CI guards the methodology — reconciliation and coverage tests fail the build if a source shifts under us.
See Methodology & sources → for the full provenance of every figure on this site.
That auditability is the point of the CSRD / ESRS E1 disclosure →: verified EU ETS emissions as the ESRS E1-6 gross Scope 1 GHG emissions datapoint, downloadable as a self-contained, audit-traceable bundle.