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Australia’s risk is a coupling of heat, fire, water and distance

Part I describes systems and their couplings. It assesses no authority and ranks no state or territory.

7 min read2 figures2 tables17 notesNR-COUNTRY-AUS-2026-BASELINE

Contents
  1. ·Edition home
  2. ·Executive summary
  3. 1Australia’s risk is a coupling of heat, fire, water and distance
    1. 1.1 The questions this part answers
    2. 1.2 The argument
    3. 1.3 Twenty couplings between five systems
    4. 1.4 Reinforcing loops
  4. 2Key findings
  5. 3Systems and sectors at baseline
  6. 4Risks and capability
  7. 5Hot, dry summer in the populated south-east
  8. 6Readings from the other desks
  9. 7The 2027 agenda
  10. 8Systems in depth
  11. AMethodology
  12. BData appendix
  13. CReferences and record
  14. ·Complete edition, for print

1.1The questions this part answers

Key questions

  • Where is Australia’s risk concentrated, and in which systems?
  • Which couplings carry shocks from one system to the next?
  • Which capabilities hold under compound stress, and which are only documented?
  • What must the 2027 programme measure first?

In this part

  • Narrative
  • Headline finding
  • Lead figure
  • Five system chapters
  • Twelve-domain reading
  • Sector screens
  • Dependency matrix
  • Risk objects
  • Capability ladder
  • Scenario
  • Three lenses
  • Portfolio

1.2The argument

Australia is a large, dry, highly urbanised country. Its resident population was 27.92 million at 31 March 2026 and is growing at 1.4% a year1. About 18.75 million people lived in the eight capital cities at 30 June 20252. This baseline reads Australian risk as the product of heat and fire forcing, a water system that varies sharply from year to year, an economy that exports energy and food, and long distances between people and the services they rely on.

The fire layer is the clearest recent example. The 2019–20 Black Summer season burnt about 24 million hectares, killed 33 people directly and destroyed more than 3,000 buildings22. A peer-reviewed study estimated 417 further deaths from smoke exposure23. The Royal Commission that followed examined national arrangements for natural disasters22.

The water layer varies by year and by sector. Australians consumed 17,223 GL in 2023–24, and agriculture, forestry and fishing used about 68% of it5. Major dam storages fell 8.1% in that year, yet area-average rainfall stayed above its long-term average5. Renewable internal freshwater is large per person at national scale, 18,909 cubic metres in 2022, but a national average hides the basins where demand and scarcity meet13.

The energy layer is a transition under way. Wind and solar supplied 33% of electricity in 2025, while fossil fuels supplied 61% and coal 43%16. Net energy exports equalled about 211% of Australia’s own energy use in 202411. A country that exports energy can still be exposed in its own supply chain. This edition holds no bound figure for liquid fuel stock depth, so it names that as a gap32.

The health and demographic layer is steady but ageing. Life expectancy was 81.1 years for males and 85.1 for females in 2022–243. 18.1% of residents were aged 65 or over in 202510. Births were 292,318 in 2024 and the total fertility rate was 1.4814.

This edition therefore reads Australia’s risk as a property of the couplings between these forces. The matrix, risk objects, capability ladder and scenario that follow ask two questions: where does a shock travel next, and who holds the capability to stop it?

Figure 1.1How have emissions moved? Emissions excluding land use (Mt CO₂e)

Emissions excluding land use were 591.5 Mt in 2024, 2.3% below 2019 and 2.1% above 20208. The targets use a different base and include land use, so this chart cannot show distance to target. The national inventory that can is not bound33.

ItemBar, scaled to the largest valueValue
2015600.8
2019605.2
2020579.5
2022571.8
2023587.5
2024591.5

Source: as cited in the note to this figure. Year 2024.

Figure ID FIG-COUNTRY-AUS-2026-BASELINE-01-003

591.5Mt CO₂e

excluding land use, 20248

387Mt CO₂

fossil CO₂, 202417

43%

2030 target below 200519

62–70%

2035 target below 200518

1.3Twenty couplings between five systems

The Australia matrix types the twenty couplings between the five core systems. Strengths are Nexus estimates from the cited evidence and analogue events; they set the starting graph that the Q1 2027 Foundry cut will test.

Figure 1.2Couplings between the five systems

Each line is one coupling from one system to another, drawn by the strength the edition assigns. Strengths are Nexus estimates from the cited evidence and analogue events.

  • Strong
  • Moderate
  • Weak

Source: this edition’s coupling matrix (Table 1.1); status Estimated.

Table 1.1Coupling matrix: from the row system to the column system
From, toWATENEFOOHLTBIO
WAT Water·STRONG
nuclear cooling · hydro		STRONG
irrigation · rain-fed yield		MODERATE
drinking water		STRONG
flows · wetlands
ENE EnergyMODERATE
pumping · treatment		·STRONG
fuel · fertiliser · cold chain		STRONG
facility power · cooling		MODERATE
reservoirs · land use
FOO FoodMODERATE
withdrawals · nutrients		WEAK
biofuel feedstock		·STRONG
nutrition · food safety		STRONG
land conversion
HLT HealthWEAK
workforce		WEAK
workforce		MODERATE
labour · disease		·WEAK
residues
BIO BiodiversitySTRONG
regulation · filtration		MODERATE
fire on lines · biomass		STRONG
pollination · soils		MODERATE
zoonoses · smoke		·
Strength: strong, moderate or weak; a Nexus estimate (status Estimated) from cited evidence and analogue events. The scale is defined in Annex A.

Transmission paths

  1. 01

    CLI → HLT

    Fire smoke reaches large cities and loads health services.

    Reported 2019–202223

  2. 02

    CLI → WAT → FOO

    Dry years cut storage and allocation, and farm output follows.

    Inferred storage and rainfall 2023–245

  3. 03

    ENE → HLT

    A hot spell raises power demand while cooling is a health need.

    Inferred no event bound

  4. 04

    TRD → ENE → FOO

    A fuel supply disruption reaches farm and freight operations.

    Inferred no event bound

  5. 05

    CLI → INF → FIN

    Fire or flood damages lifelines and the loss falls on insurers and budgets.

    Inferred loss series not bound

1.4Reinforcing loops

A shock entering either system of a loop can return amplified through the other.

Table 1.2Pairs of systems where both directions are rated strong
LoopFirst directionSecond direction
WAT and BIOWater to biodiversity: flows · wetlandsBiodiversity to water: regulation · filtration
FOO and BIOFood to biodiversity: land conversionBiodiversity to food: pollination · soils
A causal-loop reading of the matrix (Sterman, Business Dynamics, 2000): structural, from estimated strengths, not a measured feedback.

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

  1. 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
  2. 2Australian Bureau of Statistics (ed.), Regional population, 2024–25. ABS, Canberra, released 31 March 2026. Observation year 2025. Retrieved 2026-11-03.back
  3. 22Royal Commission into National Natural Disaster Arrangements (ed.), Report. Commonwealth of Australia, Canberra, October 2020. Observation year 2019–20.back
  4. 23N. Borchers Arriagada et al., “Unprecedented smoke-related health burden associated with the 2019–20 bushfires in eastern Australia,” Medical Journal of Australia, vol. 213, no. 6, pp. 282–283, 2020.back
  5. 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
  6. 13World Bank (ed.), World Development Indicators: renewable internal freshwater resources per capita and annual freshwater withdrawals (ER.H2O.INTR.PC, ER.H2O.FWTL.ZS), Australia; upstream FAO AQUASTAT. World Bank, Washington DC. Observation year 2022. Retrieved 2026-11-03.back
  7. 16Ember (ed.), Australia: electricity data explorer, full-year 2025. Ember, London. Observation year 2025. Retrieved 2026-11-03.back
  8. 11World Bank (ed.), World Development Indicators: energy use per capita and net energy imports (EG.USE.PCAP.KG.OE, EG.IMP.CONS.ZS), Australia; upstream IEA. World Bank, Washington DC. Observation year 2024. Retrieved 2026-11-03.back
  9. 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
  10. 3Australian Bureau of Statistics (ed.), Life expectancy, 2022–2024. ABS, Canberra, released 11 November 2025. Observation years 2022–24. Retrieved 2026-11-03.back
  11. 10World Bank (ed.), World Development Indicators: population ages 65 and above and urban population (SP.POP.65UP.TO.ZS, SP.URB.TOTL.IN.ZS), Australia; upstream UN Population Division. World Bank, Washington DC. Observation years 2024–2025. Retrieved 2026-11-03.back
  12. 4Australian Bureau of Statistics (ed.), Births, Australia, 2024. ABS, Canberra, released 15 October 2025. Observation year 2024. Retrieved 2026-11-03.back
  13. 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
  14. 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
  15. 17Our World in Data (ed.), CO₂ emissions: Australia country profile, based on Global Carbon Project data. Our World in Data, Oxford. Observation year 2024. Retrieved 2026-11-03.back
  16. 19Government of Australia (ed.), Australia’s Nationally Determined Contribution: communication 2022 (43% below 2005 by 2030). Submission to the UNFCCC, June 2022. Observation year 2022.back
  17. 18Government of Australia (ed.), Australia’s 2035 Nationally Determined Contribution (62 to 70% below 2005). Submission to the UNFCCC, September 2025. Observation year 2025.back

Cite this chapter

Valadbaygi, S. (Ed.). (2026). Chapter 1: Australia’s risk is a coupling of heat, fire, water and distance. In Australia Systems Risk and Resilience Report 2026: The State of Australia’s Interdependent Systems (Baseline Edition 2026, Report No. NR-COUNTRY-AUS-2026-BASELINE) [Draft under review]. The Global Centre for Risk and Innovation (GCRI).

Every citation form of the whole report, BibTeX and RIS included, is on the edition home. Cite this report

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Sector signature

The sectors behind Australia.

A reading aid: the sectors the findings run through and how strongly they depend on each other.

Select corners · hover lines6 / 15 relations

Context

Heatwave

Cooling demand peaks the grid while rivers warm; heat stress fills hospitals and wilts crops.

W · E · I · F · H · B

Sectors
4 of 6
Relations
6 of 15
Coupling
0.43 share of total

Strongest relations in play

  • Water → Energy · cooling water and hydropower0.6
  • Water → Food · irrigation0.8
  • Food → Health · nutrition0.7
  • Water → Health · drinking water and sanitation0.7
Teaching values for a typical city-region, not measurements for any place. Coupling is the summed strength of the relations in play, as a share of all fifteen.
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