Methodology — Environmental Risks Monitor

Scope and Purpose

ERM covers the intersection of Earth system science and strategic risk. Its analytical position is that planetary boundary transgressions and tipping system dynamics are not solely environmental concerns — they are causal drivers of geopolitical instability, economic disruption, legal liability, and security risk. ERM treats environmental developments as first-order strategic intelligence, not background context.

The monitor's geographic scope is global, with no regional exclusions. Its temporal scope is weekly — each issue covers the seven-day period ending on Saturday at 05:00 UTC. Persistent state is maintained across issues, so boundary status and tipping system flags carry forward unless explicitly revised.

ERM does not cover routine climate news, corporate ESG disclosures, or speculative clean technology developments. It focuses on signal — measurable deviations from physical baselines, confirmed regulatory shifts with binding implications, and early-warning indicators for non-linear Earth system transitions.

Why the Planetary Boundaries Framework

ERM is organised around the planetary boundaries framework developed by the Stockholm Resilience Centre and the Potsdam Institute for Climate Impact Research. This framework defines nine biophysical processes that regulate the stability and resilience of the Earth system. Each boundary has a threshold — a level of human pressure beyond which the risk of abrupt or irreversible environmental change increases substantially.

The framework was chosen because it provides a scientifically grounded, internationally accepted structure for measuring cumulative human pressure on Earth systems. It enables consistent tracking across multiple indicators, supports version history and trend analysis, and creates a stable reference against which weekly deviations can be assessed. The boundaries are not arbitrary political targets — they are derived from paleoclimatic evidence of the conditions that have supported stable human civilisation for the last 10,000 years.

ERM uses the 2023 Science paper (Richardson et al.) as the current reference for boundary status. Six boundaries are assessed as transgressed in that update: Climate Change, Biosphere Integrity, Land System Change, Freshwater Change, Biogeochemical Flows, and Novel Entities.

Tier 1 Primary Sources

ERM draws on a defined set of Tier 1 primary sources — organisations whose data products and assessments meet the bar for direct citation without further verification. These are sources with institutional independence, peer-reviewed methodologies, and established track records in their respective domains.

IPCC — Intergovernmental Panel on Climate Change

Authoritative synthesis of climate science. Assessment Reports and Special Reports provide the baseline against which ERM measures current observations. Used for probability ranges, temperature projections, and sea level rise assessments.

SRC — Stockholm Resilience Centre

Primary authors of the planetary boundaries framework. SRC publications define boundary statuses and thresholds used throughout ERM. The 2023 Richardson et al. Science paper is the current reference for all nine boundaries.

C3S — Copernicus Climate Change Service

European Commission climate monitoring service providing near-real-time atmospheric and surface temperature data. Used for weekly temperature anomaly tracking, sea ice extent, and European regional climate indicators.

UNFCCC — UN Framework Convention on Climate Change

Primary source for international climate policy, NDC tracking, COP outcomes, and the Loss and Damage Fund. ERM's M05 Policy and Law module tracks UNFCCC-mandated commitments and their implementation status.

IDMC — Internal Displacement Monitoring Centre

Primary source for displacement data attributable to natural disasters and climate events. Used in ERM's M03 Threat Multiplier module to track physical-to-human cascade pathways (F1 filter tag).

Signal Criteria

A development qualifies as a signal in ERM — and is eligible for the M00 lead signal position — if it meets at least one of the following four criteria:

Measurable deviation from a physical baseline. The development represents a quantifiable departure from an established reference period or model projection — for example, a satellite measurement that exceeds the upper bound of IPCC projections, or a proxy metric that enters a range not previously observed in the monitoring record.
Multi-week persistence. A signal that has been present for two or more consecutive weekly observations is treated as a sustained early-warning indicator rather than an episodic event. Persistence elevates a development from noise to signal regardless of its absolute magnitude.
Boundary-relevant trigger. The development has a direct mechanistic connection to one of the nine planetary boundaries — either by directly altering boundary status, or by activating a known feedback pathway (for example, freshwater melt injection into AMOC or deforestation pressure approaching the Amazon dieback threshold).
Cascade initiation. The development marks a confirmed first-step in a physical-to-human cascade chain — where environmental stress is translating into food insecurity, displacement, economic disruption, or political instability. A development at the cascade initiation stage carries signal status even if the physical magnitude is moderate.

Filter Tags — F1 to F4

ERM applies filter tags to classify the nature of each intelligence item. These tags are descriptive — they indicate what kind of risk or signal pattern a development represents — and are used for filtering and cross-referencing across the archive.

F1 — Cascade: Physical to Human

Applied when a physical environmental stress is driving or has driven a human-system consequence: food insecurity, displacement, water conflict, or political instability. F1 signals are the most direct evidence that planetary boundary transgressions are translating into strategic risk.

F2 — Regulatory Vacuum or Policy Failure

Applied when a governance mechanism is absent, has failed to meet binding commitments, or has been superseded by events without an adequate institutional response. F2 signals indicate that Earth system pressures are operating outside any effective regulatory framework.

F3 — Tipping System Early Warning

Applied when a proxy metric for a recognised tipping system enters a range consistent with pre-tipping dynamics, or when modelling revises collapse probability upward. F3 signals are the highest-priority indicators tracked by ERM because tipping systems can trigger irreversible transitions.

F4 — Attribution Gap

Applied when significant environmental damage is occurring without any binding liability or attribution mechanism — where no state, institution, or actor can be held accountable under existing international law. F4 signals identify structural governance voids where Earth system damage accumulates without institutional response.

Status Definitions and Colour Bands

Planetary boundary statuses follow the Stockholm Resilience Centre definitions:

Transgressed The boundary has been exceeded. Human pressure on this process has moved outside the safe operating space. Risk of abrupt or irreversible change is elevated.

High Risk Approaching the boundary. Current trajectory is on course to cross the threshold within the assessment period if current trends continue.

Increasing Risk Within the boundary but with worsening trend. Risk is increasing and the direction of change is adverse.

Safe Within the safe operating space with a stable or improving trend. Active monitoring continues.

Trend values:

Worsening Direction of change is adverse — boundary pressure is increasing or status is deteriorating.

Stable No significant directional change in the current observation period.

Improving Direction of change is favourable — boundary pressure is decreasing or status is recovering.