P05 — Temporal Persistence and Baseline Integrity

SCD-P05  ·  Principle 5 of 10
  Temporal Persistence and Baseline Integrity
  “A result without a baseline is a claim without evidence.”
  Technical Layer
Definition
Sovereign climate data requires: (a) a documented, defensible baseline established before intervention begins; (b) historical data that is permanently owned and accessible regardless of vendor relationships; and (c) consistent methodology applied longitudinally — or, where methodology changes, an explicit reconciliation of the historical series to the new methodology.
Rationale
Investors and regulators need longitudinal data to assess whether impact is improving over time. A single-year snapshot without a consistent baseline is commercially and legally worthless for bond verification, carbon credit issuance, or ISSB S2 reporting. CEPAL's Sustainable Bonds LAC analysis (2024) found that the absence of defensible baselines is the primary reason LATAM green bonds cannot demonstrate impact at renewal.
Implementation Steps
Define and document your baseline before any intervention — not retroactively.
Store at least 3 years of historical data in systems you own and control.
When changing providers, negotiate full historical data export as a contractual condition.
Apply ISSB S2's transition provisions: restate comparatives when methodology changes.
Conduct an annual baseline review to confirm it remains defensible against current standards.
Compliance Checklist
  
Criterion
What it means
  
☐
Baseline documented pre-intervention
Baseline was set before the activity it measures, with date stamp.
☐
3+ years of history owned
Historical data is in your own systems, not exclusively with a vendor.
☐
Methodology consistent or reconciled
Any methodology changes are logged with impact on historical figures.
☐
Annual baseline review conducted
Baseline reviewed annually against current IPCC / GRI standards.
Regulatory References
ISSB IFRS S2 — Para. 22–28 (Transition provisions and comparatives)
CEPAL — Sustainable Bonds LAC: Decade of Growth 2014–2024
GRI 305-1 (Scope 1 GHG) — Section 3.3 (Base year recalculation policy)
Recommended Tools and Platforms
EDGAR time series GFW Hansen dataset v1.11+ IDEAM national GHG inventory series
Keywords
baseline temporal consistency historical data GHG inventory bond verification ISSB S2
  Related Principles: SCD-P04 · SCD-P08
  Document ID: SCD-P05  | 
  Version: 1.0.0  | 
  Last Updated: 2026-05-26  | 
  Category: Technical Quality  | 
  Source: CleantechHUB Sovereign Climate Data Framework  | 
  Licence: CC-BY 4.0
  
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