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Global systems series

Global systems reports try to describe risks that no single discipline owns: climate, food, finance, health and technology acting on each other. Synthesis at that scale is where small weaknesses in the evidence base become large ones, because the report is read as a summary of everything known. This page sets out how global syntheses are built and reviewed, where their evidence is thin or skewed, and how their statements travel into decisions.

01In brief

The short answer.

A global risk assessment is a synthesis of evidence on risks that cross disciplines and borders, such as climate, food, finance, health and technology acting on each other. At that scale small weaknesses in the evidence base become large, because the report is read as a summary of everything known; uneven geographic and language coverage is a common one.

02Geography

Systemic exposure in the contiguous United States.

Where people and networks concentrate, the exposure through which shocks travel between systems, shown for the contiguous United States as an example geography for this subject.

Where people and networks concentrate, the exposure through which shocks travel between systems.Indicator derived from Natural Earth at map scale; a screening view, not an assessment.
GCRI · Nexus Reports · fieldDESIGN FIGURE
03Console

Series production desk, in outline.

The working screen behind this subject: its structure, terms and states. Names are placeholders and values illustrative.

Series production desk

Global systems series · Annual synthesis · Edition 5

Data check behind planGCRI · Nexus Reports

Editions in production

Annual synthesisGlobalData check89W38
Country profile 7CountryPeer review98W18
Water outlookSectoralDrafting47W16
Methods note 4MethodsReleased100done

Data check, annual synthesis

Values traced71 pct · req 100Labels attached94 pct · req 100Uncertainty stated85 pct · req 100

Edition pipeline

  1. Outlineboard
  2. Draftauthors
  3. Data checkevery value
  4. Peer reviewtwo rounds
  5. Editorialdecision
  6. ReleaseDOI
  7. Correctionsversioned
Series production desk: the screen's structure, terms and states for Global systems series.Placeholder names and illustrative values; a design, not a record or a live system.
04The question

Global systems series: how the risk develops.

Interdependent global system risks. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Mechanism

Uneven evidence base

Published literature is concentrated in some regions, languages and disciplines. A synthesis that assesses only what is indexed in English inherits those gaps and can present an absence of evidence as an absence of risk.

Mechanism

Aggregation hides disagreement

Combining findings across fields with different methods and definitions can produce a statement that no single study supports. Calibrated language and traceable accounts keep the level of agreement visible instead of averaging it away.

Mechanism

Statements travel without caveats

A headline from a summary is quoted in briefings, media and other reports, often without its confidence qualifier or its scope. Each repetition moves the statement further from the evidence behind it.

Mechanism

Errors propagate by citation

A flawed or retracted source cited in a global synthesis can be carried into national plans and sector studies that cite the synthesis rather than the source, so a correction upstream may not reach users downstream.

05Key terms

Terms used on this page.

Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.

TermDefinition
ConfidenceIn IPCC usage, a qualitative judgement of the validity of a finding based on evidence and agreement.
LikelihoodIn IPCC usage, a probabilistic statement of an outcome, such as likely for a probability above two in three.
Literature cut-offThe date after which new studies are not assessed in a report.
06Indicators

What is measured, and how well.

Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.

IndicatorUnitCadenceSource typeLabel
Assessed literature by region of author affiliationpercent of cited works by regionper reportBibliographic metadata matched to institution registryESTIMATED
Assessed literature by language of publicationpercent of cited works by languageper reportReference list metadataREPORTED
Key statements carrying calibrated confidence or likelihoodpercent of summary statementsper reportEditorial audit of the summaryREPORTED
Review comments received and answeredcount received; percent with recorded responseper review roundReview comment logOFFICIAL
Literature cut-off to publication intervalmonthsper reportReport front matterDECLARED
Cited works with a persistent identifierpercent of referencesper versionReference metadataOBSERVED
Cited works later retracted or flaggedcount per reportquarterlyRetraction records matched to referencesOBSERVED
07Canvas

From sources to decisions.

The topic as a computational graph: named sources feed the methods, an evidence review gates the outputs, and the decisions stay with the authorities that hold them.

Pipeline canvas · Global systems series as a run graphDesign, not a record
Global systems series: an edition from outline to correctionAn outline is agreed; chapters are drafted; every value is traced in the data check; peer reviewers with declared conflicts review; the editor decides; the edition is released with an identifier and corrected only by new versions. Design of the process, not a record of a run.

Fig. 02Nodes carry their type, two metric rows and a state; connectors show what feeds what; dashed frames name the owners; the timeline is the cadence. Design of the pipeline, not a record of a run.

08Sources

Where the evidence comes from.

Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.

SourceWhat it givesLicence class
IPCC report archive and review recordsAssessment reports, summaries for policymakers, expert and government review comments with author responsesFree to read, IPCC copyright, reuse terms per IPCC
IPBES assessment archiveGlobal and regional biodiversity assessments, summaries and review documentationFree to read, reuse terms per IPBES
UNDRR Global Assessment Report archiveGlobal assessments of disaster and systemic riskFree to read, United Nations terms
OpenAlexWorks, authors, institutions, languages and citation links across disciplinesCC0
Crossref metadataDOIs, references, funding and update notices for scholarly worksOpen metadata, no reuse restrictions
Retraction Watch Database via CrossrefRetractions, expressions of concern and corrections with reasonsOpenly available through Crossref, attribution requested
09Decisions

Who decides, and what the evidence serves.

Nexus Reports prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Who decidesThe questionEvidence this page serves
Ministries of foreign affairs, finance and environmentWhich global risks warrant national attention, joint action or negotiation positionsSummary statements with calibrated confidence, the scope of each and its evidence gaps
Intergovernmental assessment bodies and their working groupsWhere a later assessment should focus or where the literature is too thin to assessCoverage profiles by region, language and discipline
Research fundersWhich gaps in the evidence base justify new calls or data collectionMapped gaps where confidence is low because evidence is limited rather than because it disagrees
Report editors and review editorsWhether every comment has been answered and every key statement can be tracedComment logs, traceable accounts and reference integrity checks

Outputs this topic produces

  • Traceable accounts linking each summary statement to its assessed sources and confidence
  • Coverage profiles of the evidence by region, language and discipline
  • Review comment logs with responses, published after approval
  • Versioned reports with correction notices linked to dependent statements
10Core questions

What the series asks.

Global risks rarely respect the boundaries of disciplines or ministries. A heatwave strains power grids, cuts crop yields, raises mortality and moves commodity prices at once. Studying such risks one sector at a time misses the connections through which they amplify. The series exists to describe those connections with evidence and to say plainly where knowledge runs out.

  • Which global systems are most tightly coupled, and through which flows of goods, energy, data, money or people?
  • Where could a disruption in one system spread to others, and what buffers slow or stop it?
  • Which slow-moving trends, such as climate change, demographic shifts or technology adoption, change the structure of those couplings?
  • What do we not know, and how would a reader recognize that a finding has become outdated?
11Scope

What the series covers.

Three series share the global view, each with a different time horizon.

Systems

Global Systems Risk and Resilience

Annual analysis of interdependent global system risks and the resilience of the systems that carry them.

Strategy

Strategic Systems

Systems whose failure would have strategic consequences, such as critical infrastructure, digital networks and supply chains.

Horizon

Foresight Outlook

Long-horizon outlooks and horizon scans, labelled as foresight and never as prediction.

Research on systemic risk has shown that tightly coupled systems with little slack can turn a local failure into a widespread one, and that the same efficiency that lowers costs in normal times can remove the buffers needed in a crisis. The series looks for these patterns: shared dependencies, concentration, synchronized shocks and feedback loops. It also looks for the opposite, the redundancy, diversity and institutional capacity that let systems absorb shocks and recover.

12Methods and evidence

How editions are built, and their limits.

  1. 01

    Systems mapping

    Dependency maps and network analysis identify couplings. They depend on data that are often incomplete for private and informal flows.

  2. 02

    Statistical evidence

    Trend and correlation analysis, built on probability and statistics, describes what has happened. Past relationships may not hold under new conditions.

  3. 03

    Models and scenarios

    Coupled models and scenarios explore what could happen. Each carries stated assumptions and uncertainty assessed with uncertainty quantification and model validation.

  4. 04

    Expert judgement

    Structured elicitation fills gaps where data are absent. It is labelled as expert judgement and its panel and process are described.

13Methods

How it is studied, and what the methods cannot say.

  1. Uncertainty quantification and model validationCalibrated language in assessments · Certainty of evidence ratingsApplied here
  2. Probability and statisticsMeta-analysis with heterogeneity stated · Small-study and publication biasApplied here
  3. Data engineering, interoperability and stewardshipStructured publishing in JATS XML · Persistent identifiers across the recordApplied here
14Questions

Questions and answers.

What is the difference between confidence and likelihood?
Under the IPCC guidance, confidence is a qualitative judgement of the type, amount, quality and consistency of evidence and the degree of agreement. Likelihood is a probabilistic statement about an outcome, used only where evidence allows it to be quantified.
Why does a global synthesis need review by governments?
In intergovernmental assessments, government review checks that summaries are clear and policy-relevant without being policy-prescriptive. The underlying assessment remains the responsibility of the authors and must stay consistent with it.
What happens when a cited source is retracted?
The editors check whether any statement depends on it, record the result, and issue a correction or a note to the version history if a statement changes. A retraction does not by itself change a conclusion supported by other evidence.
Does Nexus Reports rank global risks?
No. Ranking depends on values and on the question being asked. The series describes evidence, interdependencies and uncertainty; those who hold the decision decide the ranking.
Does the series rank global risks?
No. It describes risks, their connections and the evidence behind each claim. It does not publish league tables or use third-party index names.
How is foresight distinguished from forecasting?
Foresight editions explore plausible futures to test assumptions; they are labelled Scenario or Expert judgement. Forecasts, where any appear, are labelled Forecast and carry their method and uncertainty.
Who reviews a global systems edition?
Specialists in each system covered, plus technical reviewers for data and models and an editor for sourcing and disclosures, under the three kinds of review.
How often are editions released?
Each series states its intended cadence on its own page. An edition appears only when it is released; a planned edition is not listed as published.
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