- Australia 2026
- Annex A
Methodology
How the edition was made: methods, the model card, the evidence cut and its age, the acceptance record and the glossary.
Contents
- ·Edition home
- ·Executive summary
- 1Australia’s risk is a coupling of heat, fire, water and distance
- 2Key findings
- 3Systems and sectors at baseline
- 4Risks and capability
- 5Hot, dry summer in the populated south-east
- 6Readings from the other desks
- 7The 2027 agenda
- 8Systems in depth
- AMethodology
- BData appendix
- CReferences and record
- ·Complete edition, for print
A.1Methods
The baseline uses published values and four simple derivations. Each is shown in full so that any reader can reproduce it.
| No. | Derivation | Calculation | Result |
|---|---|---|---|
| (1) | Change in emissions excluding land use, 2019 to 2024 | (591.5 − 605.2) ÷ 605.2 | −2.3% |
| (2) | Change in emissions excluding land use, 2020 to 2024 | (591.5 − 579.5) ÷ 579.5 | +2.1% |
| (3) | Share of water consumed by agriculture, forestry and fishing | 11,760 ÷ 17,223 | 68.3% |
| (4) | Share of annual population growth from net overseas migration | 292,100 ÷ 392,700 | 74.4% |
| Strength | Definition |
|---|---|
| STRONG | a disruption in the source system has historically changed the target system’s service or output within one season |
| MODERATE | an effect is documented but buffered or slower |
| WEAK | an effect is plausible but not documented at national scale |
| Label | Rule |
|---|---|
| Reported | value as issued by its source, with year |
| Inferred | reasoned from cited evidence; never a measurement |
| Estimated | Nexus analytical value with stated method |
| Scenario | conditional on stated assumptions |
| Expert input | structured editorial judgement awaiting evidence |
A.2Model card, National Model v0
- Model ID
- MDL-AUS-NATIONAL · v0.1
- Purpose
- represent Australia as coupled water, energy, food, health and biodiversity systems with forcing and transmission layers
- Family
- graph-based system of systems
- Inputs
- the cited sources of this edition; no proprietary data
- Method
- expert-specified coupling strengths (STRONG · MODERATE · WEAK) from evidence and analogue events
- Validation
- none yet, first validation against Q1 2027 Foundry evidence
- Uncertainty
- qualitative; strengths are hypotheses, not measurements
- Domain of validity
- national scale; not for state or territory or asset-level use
- Reproducibility
- strength table and sources published in this edition
20couplings
typed in v0
9strong
documented within one season
7moderate
documented, buffered
4weak
plausible, undocumented
A.3The baseline evidence cut
Every Nexus edition is published from a frozen evidence cut. The baseline cut is documentary: it pins the exact edition of every source cited. Model runs begin with the first Foundry cut in Q1 2027.
- Cut ID
- NQ-AUS-2026-Q0-1
- Type
- baseline documentary cut
- Resolution policy
- pinned · as of 30 September 2026
- Sources pinned
- 53 cited sources, each at the edition and retrieval date in the references
- Model runs
- none at baseline, analytical values are stated with their method
- Digest
- computed at freeze and recorded in the publication record
- Supersedes
- nothing, first cut of the series
- Superseded by
- NQ-AUS-2027-Q1-1 at the Q1 2027 close
Lineage
- 01
source edition
- 02
pinned citation
- 03
finding
- 04
page
- 05
publication record
| Element | Baseline 2026 | Q1 2027 |
|---|---|---|
| Sources | cited publications, pinned by edition | qualified source bindings with versions |
| Analysis | stated methods and editorial estimates | typed analysis specifications |
| Models | National Model v0 specification | model runs with receipts |
| Findings | twelve baseline findings | findings re-bound to the cut |
| Review | five passes scheduled | five passes on the exact digest |
A.4Evidence age and coverage
A 2026 edition rests on evidence observed in many different years. This page shows each time base, so that no single year label hides older evidence.
| Indicator | Observed | Released | Cadence | Next release |
|---|---|---|---|---|
| Population | Mar 2026 | Sep 2026 | quarterly | next quarterly release |
| Life expectancy | 2022–24 | Nov 2025 | annual | annual |
| Births | 2024 | Oct 2025 | annual | annual |
| Water Account | 2023–24 | Dec 2025 | annual | annual |
| GDP | Jun 2026 qtr | Sep 2026 | quarterly | next quarterly release |
| Electricity mix | 2025 | not recorded | annual | annual |
| Emissions excluding land use | 2024 | not recorded | annual | annual |
| Protected areas | 2024 | not recorded | annual | annual |
| Agricultural land | 2021–22 | Jan 2023 | final issue | later series not read |
| System | Coverage | Thinnest dimension |
|---|---|---|
| Climate and fire | PARTIAL | emissions against 2005; loss series |
| Energy | PARTIAL | fuel and gas stock depth |
| Water | GOOD | basin storage by state |
| Food | PARTIAL | household food insecurity |
| Health | PARTIAL | heat-related deaths |
| Biodiversity | THIN | threat status and reef condition |
| Finance | THIN | insured and uninsured losses |
| Digital | THIN | dependency mapping |
A.5Evidence cards, two anchor sources
Issued by the Australian Bureau of Statistics. Quarterly. Role: binds the population, growth and state figures in the profile and regional reading.
EVD-AUS-001
Population estimates, March 20261
Issued by the Australian Bureau of Statistics. Annual, financial-year basis. Role: binds the water consumption, storage and rainfall findings. Irrigation estimates are experimental and break the series.
EVD-AUS-002
Water Account 2023–245
| Dimension | EVD-AUS-001 | EVD-AUS-002 |
|---|---|---|
| Completeness | all states and territories | all industries and households |
| Timeliness | about 5 months after the reference date | about 17 months after the financial year |
| Revision | revised with later releases | series break in irrigation method |
| Method transparency | published methodology | published methodology |
| External validation | not assessed in this edition | satellite model flagged as experimental |
Evidence cards to follow in Q1 2027
A.6Publication acceptance record
Editorial self-check at evidence close. Every applicable item carries a disposition; the remaining items are review, approval and deposit.
| Group | Area | Items | Pass | N/A | Pending |
|---|---|---|---|---|---|
| D1 | Identity and scope | 8 | 8 | 0 | 0 |
| D2 | Source and data | 12 | 9 | 1 | 2 |
| D3 | Analysis and models | 12 | 3 | 8 | 1 |
| D4 | Findings and claims | 9 | 8 | 0 | 1 |
| D5 | Figures, tables, maps | 10 | 6 | 2 | 2 |
| D6 | Editorial and citations | 10 | 8 | 0 | 2 |
| D7 | Review and approval | 13 | 0 | 0 | 13 |
| D8 | Artefact and design | 12 | 7 | 0 | 5 |
| D9 | Registry and release | 9 | 0 | 0 | 9 |
Publication gate
- Conditions met
- 14 of 23 at evidence close
- Blocking problems
- none recorded
- Open conditions
- reviews, approval of the exact digest, deposit, registry pointer
Not applicable at baseline
- Model runs
- first runs in Q1 2027
- Maps
- plates in Q2 2027
- Waivers
- none
A.7Status words
| Status | What it means |
|---|---|
| Observed | Measured directly and published by the source. |
| Reported | Published statistics of an official or institutional source. |
| Declared | Stated by the body concerned; not independently measured. |
| Estimated | A Nexus estimate from cited evidence, with its method in Annex A. |
| Modelled | Produced by a stated model from cited inputs. |
| Inferred | Reasoned from cited evidence; not measured. |
| Forecast | A projection by the cited source. |
| Simulated | A simulation result under stated assumptions. |
| Scenario | A conditional statement under stated assumptions; never a prediction. |
| Expert input | Expert judgement, recorded with its basis. |
| Candidate | Proposed for a later edition; not yet evidence. |
| Evidence-quality levels (EQL 1 to 5) grade the source behind a value; they are not a score of the subject. | |
A.8How the edition is made, released and corrected
Every edition is built from a sealed evidence cut, reviewed under three keys, signed and deposited before any site shows it as published; corrections go to Nexus Standards as change proposals and feed the next cut.
| Step | What happens | Source |
|---|---|---|
| 01 Evidence arrives from the pillars | Foundry seals observations and indicator series, Universe hands over after-action and scenario findings, and contributions are screened at every gateway, including this site’s. | |
| 02 The cut is sealed | On the cut date the evidence is pinned under one identifier, so anyone can rebuild the edition from exactly what it was built on. | |
| 03 The edition is assembled | The edition is drafted from its template and content pack. Agents may draft; they never publish and never decide. | |
| 04 The keys turn | At the publisher of record the truth key comes first: every value is checked against its source or stated method before the meaning and capital keys turn. No edition moves on until every key has been turned by a named steward. | |
| 05 The gate opens | A named approver releases one exact digest of the edition; any change after this point is a new version, never a silent edit. | |
| 06 Signed and deposited | The PDF, the web edition and the data bundle are signed together with a manifest and an RO-Crate description, and deposited on Zenodo with a concept and a version DOI. | |
| 07 Published on its desk’s site | Only then does the edition show as published on its desk’s Reports site, and the Collection lists it as a part. | |
| 08 Corrections go to Standards | Method and correction findings go to Nexus Standards as change proposals; citations, corrections and new contributions feed the next evidence cut. |
A teaching model of the process, not a forecast and not a record of any run; dates and counts on this page come from the programme record. Sources: Reports governance at GCRI Canada (2026); Zenodo, repository of record for Reports deposits (2026).
Lifecycle, one state at a time: Draft, Computed, Evidence bound, Reviewed, Approved for release, Published, Corrected, Superseded. This edition is a draft.
A.9Glossary and abbreviations
| Term | Meaning |
|---|---|
| Baseline Edition | the inaugural annual edition that fixes the reference state for the series |
| WEFH+B | water, energy, food, health and biodiversity, the national nexus core |
| Coupling | a typed dependency through which one system transmits to another |
| Protection gap | the share of losses not covered by insurance |
| Capability ladder | LISTED → EXISTS → ADEQUATE → TESTED → DEMONSTRATED |
| EQL | evidence-quality level, 1–5 |
| Evidence cut | a frozen resolution of exact sources and versions |
| NNC · NLC · NWG | National Nexus Consortium · National Leadership Council · National Working Groups |
| Abbreviation | Expansion |
|---|---|
| ABARES | Australian Bureau of Agricultural and Resource Economics and Sciences |
| ABS | Australian Bureau of Statistics |
| AEMO | Australian Energy Market Operator |
| AIHW | Australian Institute of Health and Welfare |
| AIMS | Australian Institute of Marine Science |
| AASB | Australian Accounting Standards Board |
| BoM | Bureau of Meteorology |
| CSIRO | Commonwealth Scientific and Industrial Research Organisation |
| DCCEEW | Department of Climate Change, Energy, the Environment and Water |
| EPBC | Environment Protection and Biodiversity Conservation |
| GL | gigalitre, one billion litres |
| MDBA | Murray–Darling Basin Authority |
| MJA | Medical Journal of Australia |
| NDC | Nationally Determined Contribution |
| WDPA | World Database on Protected Areas |
A.10Technical annex
| Item | Annex | Contents | Status |
|---|---|---|---|
| A.1 | Indicator definitions | the baseline indicator set, with units and sources | IN THIS EDITION |
| A.2 | Coupling strengths | the twenty-cell matrix and its rationale | IN THIS EDITION |
| A.3 | Scenario specification | SCN-AUS-FIR-01 assumptions and signposts | IN THIS EDITION |
| A.4 | Capability placements | rung evidence for fifteen functions | IN THIS EDITION |
| A.5 | Model diagnostics | first runs and validation | Q1 2027 |
| A.6 | Sensitivity analyses | influence of coupling strengths | Q2 2027 |
| A.7 | State and territory notes | atlas cards for every state or territory | Q2 2027 |
| A.8 | Review statements | pass-by-pass review record | AT RELEASE |
A.1 · indicator definition, emissions excluding land use
- Construct
- annual greenhouse-gas emissions without land use, land-use change and forestry
- Unit
- Mt CO₂e
- Scope
- calendar year
- Source
- World Bank indicator series8
- Revision
- revised by the upstream issuer; not tracked here
- Known limits
- differs from the national inventory, which includes land use and uses 2005 as its target base
Notes
Numbers are the edition’s reference numbers, so a note reads the same in every chapter. The full list, with every source and its licence, is in Annex C. Annex C, references
- 1Australian Bureau of Statistics (ed.), National, state and territory population, March 2026. ABS, Canberra, released 17 September 2026. Observation year 2026. Retrieved 2026-11-03.back
- 5Australian Bureau of Statistics (ed.), Water Account, Australia, 2023–24. ABS, Canberra, released 11 December 2025. Observation year 2023–24. Retrieved 2026-11-03.back
- 33Department of Climate Change, Energy, the Environment and Water (ed.), Australia’s National Greenhouse Gas Inventory: Quarterly Update. DCCEEW, Canberra. Latest update; not read at evidence close.back
- 32Department of Climate Change, Energy, the Environment and Water (ed.), Australian Energy Update 2025. DCCEEW, Canberra, 2025. Observation year 2023–24; not read at evidence close.back
- 34Australian Institute of Health and Welfare (ed.), Australia’s Health 2024. AIHW, Canberra, 2024. Observation year 2024; not read at evidence close.back
- 47S. Valadbaygi (ed.), Reports: The Foundational Edition, Volumes I and II. Reports series, Edition 2026–2030, V1.0. The Global Centre for Risk and Innovation (GCRI) for the Nexus Consortium, Toronto, 2026.back
- 48S. Valadbaygi (ed.), Global Systems Risk & Resilience Report 2026: Baseline Edition. GCRI for the Nexus Consortium, Toronto, 2026.back
- 8World Bank (ed.), World Development Indicators: total greenhouse gas emissions excluding LULUCF (EN.GHG.ALL.MT.CE.AR5), Australia. World Bank, Washington DC. Observation year 2024. Retrieved 2026-11-03.back