In 2015, research framed carbon risk around a potential “carbon bubble”: fossil-fuel reserves valued by markets even though a significant share might become uneconomic or unusable under tighter climate constraints. It also made an important distinction that remains relevant: fossil-fuel divestment could raise awareness and challenge high-carbon business models, but divestment alone was unlikely to provide a sufficient risk management response.[1]
A decade later, the central argument has become broader and more financially concrete. Carbon risk is no longer confined to the possibility that coal, oil or gas reserves become stranded. It now travels through carbon prices, border taxes, technology substitution, insurance costs, physical disruption, disclosure requirements, litigation, customer procurement standards and the price of finance.
Investors therefore need to treat carbon exposure as a set of transmission channels that can alter revenue, margins, capital expenditure, asset lives, creditworthiness and terminal value.
The investment question is not whether every carbon-intensive asset will lose value. It is whether conventional valuation adequately captures the range, timing and interaction of climate-related outcomes.
What is carbon risk?
Carbon risk is the possibility that greenhouse-gas emissions, dependence on carbon-intensive inputs, or climate change will affect the financial performance or valuation of an asset, company, sector or portfolio.
It is useful to divide it into four connected categories.
Transition risk and regulatory risk arise from changes in policy, regulation, technology, energy systems, consumer behaviour and market expectations as economies move toward lower emissions.
Physical risk arises from acute events such as floods, wildfires, cyclones and heatwaves, as well as chronic changes such as water stress, sea-level rise and higher average temperatures. These risks may damage assets, interrupt production, reduce labour productivity, disrupt logistics and increase insurance costs.
Conduct and liability risk includes climate-related litigation, inaccurate disclosures, weak transition claims, and greenwashing allegations. Failures to meet contractual or regulatory commitments can result in compliance risks.
Measurement and model risk arises because emissions data, supply-chain information and long-term climate scenarios remain incomplete. A company may appear resilient simply because the analysis uses broad sector averages, excludes material Scope 3 emissions, assumes uninterrupted insurance or applies a single orderly-transition pathway.
Carbon risk cannot be managed by replacing uncertainty with a precise-looking number. It requires ranges, scenarios and explicit assumptions. The International Financial Reporting Standards (IFRS) S2 Climate-related Disclosures similarly distinguishes between physical and transition risks and focuses on climate-related matters that could affect cash flows, access to finance or cost of capital.[2]
Why this is important for investors
1. Carbon exposure can change cash flows before it changes demand
A company does not need to lose all demand for its products to experience carbon-related risk pressure. Its margins may narrow because of emissions charges, higher power costs, compliance expenditure, verification requirements or customer demands for lower-carbon inputs.
The European Union’s Carbon Border Adjustment Mechanism (CBAM) illustrates this transmission channel. Its definitive phase began on 1 January 2026 and covers carbon-intensive imports including iron and steel, aluminium, cement, fertilisers, electricity and hydrogen. Importers must report embedded emissions and surrender certificates linked to the EU Emissions Trading System price, with deductions available where a carbon price has already been paid in the country of production.[3]
For an investor in a non-EU producer, the relevant questions are practical: Can the company calculate product-level embedded emissions? Can those figures be verified? Will the carbon cost be absorbed, passed to customers or offset by cleaner production? Could a lower-emissions competitor gain market share?
These are questions about margins and competitiveness, not only environmental performance.
Recent Reuters analysis has treated CBAM as a live corporate-strategy issue involving supply-chain mapping, emissions data, compliance budgets and market access. In order to prevent strategy risk, carbon accounting is becoming part of commercial and investment due diligence.[4]
2. Carbon risk can shorten asset lives and reduce terminal value
Valuation models frequently assume that productive assets operate for their expected engineering life. Carbon risk can make economic life shorter than physical life.
A coal-fired power plant, refinery, blast furnace, internal-combustion-engine component facility or gas network may remain technically functional while becoming less competitive, more expensive to finance or inconsistent with customer requirements. The resulting impairment may appear through lower utilisation, accelerated depreciation, closure costs or new capital expenditure required to retrofit the asset.
This is where the original stranded-asset thesis remains useful. However, the analysis should not stop at fossil-fuel reserves. Investors should examine every long-lived asset whose economics depend on a carbon-intensive process continuing under a particular policy, technology and demand pathway.
The International Energy Agency’s World Energy Outlook 2025 demonstrates why scenario discipline matters. Under its Current Policies Scenario, oil and natural-gas demand continue to grow to 2050. Under its Stated Policies Scenario, oil demand flattens by the end of the 2020s and coal use peaks earlier.[5]
The investment implication is not that one pathway should be selected as certain. It is that the same asset can have materially different utilisation, pricing and terminal-value outcomes under plausible scenarios.
3. Carbon risk is entering the cost of capital and collateral system
One of the clearest signs that carbon risk has moved into mainstream finance is its treatment by central banks and financial-reporting standard setters.
IFRS S2 defines climate-related risks in terms directly relevant to investors: risks that could affect cash flows, access to finance or cost of capital over the short, medium or long term. It requires disclosure of governance, strategy, risk management processes, metrics and targets. It also requires companies to use climate-related scenario analysis when assessing the resilience of their strategies and business models.
The European Central Bank has gone further by incorporating climate sensitivity into its collateral framework. A climate factor for eligible corporate bonds became effective on 15 June 2026. On 24 July 2026, the ECB announced plans to extend the approach to certain non-financial corporate credit claims.
The framework considers sector stress, debtor exposure and residual maturity. The maximum additional reduction in collateral value for covered bonds and credit claims will be 5%.[6]
This shows how climate transition uncertainty can affect the valuation and acceptance of financial assets as security. Carbon risk can migrate from an ESG questionnaire into borrowing capacity, credit spreads and refinancing conditions.
4. Physical climate risk can undermine insurability and asset value
The carbon-risk discussion once focused heavily on transition policy. Investors now need to give equal attention to physical risk.
Swiss Re reported that natural catastrophes caused $107 billion in insured losses in 2025. Wildfires, severe storms and floods accounted for a record 92% of the total. The reinsurer also emphasised that exposure growth, higher asset values, reconstruction costs and changing hazards are increasing loss potential.[7]
Insurance is not a complete transfer of risk. Premiums can rise, deductibles can increase, exclusions can widen and coverage can become unavailable. An asset may lose value before direct damage if buyers or lenders question its insurability.
Recent Reuters reporting has described extreme weather as a financial event affecting insurance, credit ratings, public finances and long-term investment returns. This shifts physical climate analysis from a sustainability appendix to asset-level underwriting. Investors need the locations of facilities, suppliers and logistics routes—not merely a company-wide emissions total.
5. Carbon risk is a supply-chain and trade risk
Many companies with modest direct emissions remain exposed to business risks through purchased electricity, raw materials, transport, suppliers and customers. This is particularly important for diversified manufacturers, retailers, technology businesses and financial institutions.
Carbon-intensive inputs can affect procurement costs. Suppliers may fail to provide verified data. Customers may impose product-carbon thresholds. Exporters may face border measures. Banks and insurers may carry financed or underwritten emissions through their clients.
For Indian companies, the issue is becoming more immediate. India’s Carbon Credit Trading Scheme is being operationalised with greenhouse-gas-emissions-intensity targets for seven energy-intensive sectors, a monitoring, reporting and verification framework, and tradable Carbon Credit Certificates for entities that outperform their targets.[8]
SEBI has also continued to develop the BRSR Core framework, including value-chain ESG disclosures and assurance or assessment requirements.[9]
The strategic implication is that carbon data is becoming commercial infrastructure. Companies that can measure emissions at facility, process and product level may be better placed to manage supply-chain risk, defend margins, access export markets and demonstrate transition progress. Companies that rely heavily on estimates may face a credibility discount.
Is divestment the answer?
Divestment remains one possible response, but the investment decision is more nuanced than a binary choice between owning and excluding fossil-fuel companies.
An investor may use exclusion where the mandate prohibits certain activities or where the downside cannot be priced with confidence.
It may use engagement where ownership provides leverage to seek better disclosure, capital discipline and transition planning.
It may use portfolio reweighting to reduce concentration while retaining sector exposure.
It may finance transition assets where credible expenditure can lower emissions without creating new long-duration carbon lock-in.
Investors may also use debt covenants, insurance conditions or performance-linked instruments to connect financing terms with measurable outcomes.
The key is to match the tool to the risk thesis. Selling shares does not eliminate real-economy emissions. Conversely, engagement without escalation, deadlines or capital-allocation consequences can become procedural rather than effective.
A credible investment policy should therefore state what would trigger engagement, voting action, reduced exposure or exit. It should also consider equity, corporate debt, bank lending, project financial risk and sovereign exposure. Carbon risk can remain in a portfolio even after listed fossil-fuel equities have been removed.
This develops the conclusion of the original analysis: divestment may be a catalyst and signalling mechanism, but it is not a complete response to systemic carbon risk.
A seven-question carbon-risk investment test
To turn the subject into decision-useful analysis and prevent governance risks, investors and leaders can apply the following test.
- Where is the exposure?
Map emissions, facilities, suppliers, customers and financed activities by geography and business line. Portfolio-level averages can hide concentrated vulnerabilities. - What is the financial transmission channel?
Implement a risk management process and identify whether the risk reaches value through revenue, operating cost, capital expenditure, impairment, insurance, financing, tax, trade or liability. - What assumptions support the valuation?
Test commodity prices, carbon prices, utilisation rates, energy costs, technology adoption, policy timing and asset lives. Avoid using a single climate pathway as a forecast. - Is the transition plan funded?
Compare targets with approved capital expenditure, research spending, procurement contracts and management incentives. A distant target without near-term allocation is not a financial plan. - Is the emissions data decision-grade?
Examine reporting boundaries, Scope 3 coverage, estimation methods, verification, restatements and product-level data. Weak data should increase the uncertainty range rather than disappear from the analysis. - What happens under disorder?
Test abrupt policy changes, technology shocks, extreme weather, insurance withdrawal, supply-chain interruption and litigation. Orderly-transition assumptions may understate near-term volatility. - What action follows?
Define thresholds for engagement, repricing, covenants, hedging, reallocation or exit. Risk analysis adds little value if it does not alter a decision.
Use scenarios—but challenge the models
Scenario analysis is essential because carbon risk is uncertain, path-dependent and potentially nonlinear. Yet investors should treat scenarios as structured thought experiments, not predictions.
The Network for Greening the Financial System (NGFS) has warned users about limitations in physical-damage estimates included in parts of its Phase V long-term scenarios after an underlying academic paper was retracted. The NGFS identified which outputs were affected and reminded financial institutions that common scenarios do not remove their responsibility to create their own risk management frameworks.[10]
The episode offers a governance lesson: model risk is part of climate risk. In order to build organisational resilience, investment committees should record data sources, version changes, limitations and sensitivity tests, while considering tail risks that standard scenarios may omit.
This is particularly important when models produce detailed percentages extending several decades into the future. Numerical precision does not necessarily indicate a narrow range of possible outcomes.
From carbon footprint to investment resilience
The most useful evolution since the 2015 divestment debate is a shift from asking, “Is this company high carbon?” to asking, “How does carbon-related uncertainty change expected cash flows and downside risk?”
That shift produces better decisions.
It distinguishes a high-emitting company with funded, verifiable transition investment from one relying on distant targets. It identifies apparently low-emitting companies with vulnerable suppliers, water-intensive operations or uninsured assets. It recognises that policy may tighten, stall or diverge across jurisdictions.
It also prevents investors from treating a portfolio carbon score as a substitute for credit analysis, asset-level physical-risk assessment or governance scrutiny.
Carbon risk creates an investment risk because it can change the probability distribution of returns. It can create stranded assets, but it can also create demand for energy efficiency, electrification, resilient infrastructure, verified low-carbon materials, adaptation services and risk transfer solutions.
The objective is not to predict a single climate future or advocate one universal investment response. It is to make uncertainty visible, connect it to financial variables and define actions before markets, regulators, insurers or physical events force the adjustment.
For investors, the practical standard should be simple: carbon analysis is complete only when it changes a valuation assumption, a risk limit, an engagement objective, a financing condition or a capital-allocation decision.
References
[1] Cambridge Centre for Risk Studies analysis of fossil-fuel divestment and emerging carbon risk [Centre for Risk Studies Viewpoints]
https://risk-studies-viewpoint.blog.jbs.cam.ac.uk/2015/01/28/the-fossil-fuel-divestment-campaign-what-role-does-it-play-in-addressing-emerging-carbon-risk/
[2] IFRS S2 climate-related financial disclosure requirements and implementation guidance [The International Financial Reporting Standards Foundation]
https://www.ifrs.org/sustainability/knowledge-hub/ifrs-resources/
[3] World Energy Outlook 2025 scenarios and fossil-fuel demand pathways [The International Energy Agency (IEA)]
https://www.iea.org/reports/world-energy-outlook-2025/overview-and-key-findings
[4] EU Carbon Border Adjustment Mechanism definitive phase and operational requirements [Taxation and Customs Union]
https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism_en
[5] ECB climate factors for corporate bonds and credit claims [European Central Bank]
https://www.ecb.europa.eu/press/pr/date/2026/html/ecb.pr260724_4~f082ce289d.en.html
[6] Global natural-catastrophe insured-loss analysis for 2025 [Swiss Re]
https://www.swissre.com/press-release/Wildfires-storms-floods-contribute-to-record-92-of-global-insured-losses-in-2025-says-Swiss-Re-Institute/7b39b1a5-b878-4a55-a5ff-bf5aa561a675
[7] Physical climate risk, insurance and investment-market reporting [Reuters]
https://www.reuters.com/sustainability/sustainable-finance-reporting/if-we-dont-invest-reducing-physical-climate-risk-now-well-pay-it-later–ecmii-2026-04-01/
[8] India Carbon Credit Trading Scheme implementation update [Press Information Bureau]
https://www.pib.gov.in/PressReleasePage.aspx?PRID=2223703&lang=1®=1
[9] BRSR Core and value-chain ESG disclosure framework [Securities and Exchange Board of India]
https://www.sebi.gov.in/legal/circulars/jul-2023/brsr-core-framework-for-assurance-and-esg-disclosures-for-value-chain_73854.html
[10] Climate-scenario limitations and model-risk warning [Network for Greening the Financial System]
https://www.ngfs.net/en/publications-and-statistics/publications/ngfs-climate-scenarios-central-banks-and-supervisors-phase-v
FAQS:
Q1.What is carbon risk?
Carbon risk is the possibility that greenhouse-gas emissions, dependence on carbon-intensive inputs, or exposure to a changing climate will affect the financial performance or valuation of an asset, company, sector or portfolio.
Q2. What are the main categories of carbon risk?
Carbon risk can be divided into four connected categories –
Transition risk arises from changes in policy, regulation, technology, energy systems, consumer behaviour and market expectations as economies move toward lower emissions.
Physical risk arises from acute events such as floods, wildfires, cyclones and heatwaves, as well as chronic changes such as water stress, sea-level rise and higher average temperatures. These risks may damage assets, interrupt production, reduce labour productivity, disrupt logistics and increase insurance costs.
Liability and conduct risk includes climate-related litigation, inaccurate disclosures, weak transition claims, greenwashing allegations and failures to meet contractual or regulatory commitments.
Measurement and model risk arises because emissions data, supply-chain information and long-term climate scenarios remain incomplete. A company may appear resilient simply because the analysis uses broad sector averages, excludes material Scope 3 emissions, assumes uninterrupted insurance or applies a single orderly-transition pathway.
Q3. How does carbon risk affect investors?
Carbon risk affects investors in the following manner –
a. Carbon exposure can change cash flows before it changes demand
A company does not need to lose all demand for its products to experience carbon-related risk pressure. Its margins may narrow because of emissions charges, higher power costs, compliance expenditure, verification requirements or customer demands for lower-carbon inputs.
b. Carbon risk can shorten asset lives and reduce terminal value
Carbon risk can make economic life shorter than physical life. A coal-fired power plant, refinery, blast furnace, internal-combustion-engine component facility or gas network may remain technically functional while becoming less competitive, more expensive to finance or inconsistent with customer requirements. The resulting impairment may appear through lower utilisation, accelerated depreciation, closure costs or new capital expenditure required to retrofit the asset.
c. Carbon risk is entering the cost of capital and collateral system
Climate transition uncertainty can affect the valuation and acceptance of financial assets as security. Carbon risk can migrate from an ESG questionnaire into borrowing capacity, credit spreads and refinancing conditions.
d. Physical climate risk can undermine insurability and asset value
Extreme weather can become a financial event affecting insurance, credit ratings, public finances and long-term investment returns. This shifts physical climate analysis from a sustainability appendix to asset-level underwriting.
e. Carbon risk is a supply-chain and trade risk
Many companies with modest direct emissions remain exposed through purchased electricity, raw materials, transport, suppliers and customers. Carbon-intensive inputs can affect procurement costs.
Q4. Is divestment enough to manage carbon risk?
Divestment remains one possible response, but the investment decision is more nuanced than a binary choice between owning and excluding fossil-fuel companies.
An investor may use exclusion where the mandate prohibits certain activities or where the downside cannot be priced with confidence.
It may use engagement where ownership provides leverage to seek better disclosure, capital discipline and transition planning.
It may use portfolio reweighting to reduce concentration while retaining sector exposure.
It may finance transition assets where credible expenditure can lower emissions without creating new long-duration carbon lock-in.
Investors may also use debt covenants, insurance conditions or performance-linked instruments to connect financing terms with measurable outcomes.
The key is to match the tool to the risk thesis. Selling shares does not eliminate real-economy emissions. Conversely, engagement without escalation, deadlines or capital-allocation consequences can become procedural rather than effective.
This develops the conclusion of the original analysis: divestment may be a catalyst and signalling mechanism, but it is not a complete response to systemic carbon risk.
Q5. How can investors manage climate-related financial risk?
Investors can manage climate-related financial risk by following a seven-question carbon-risk investment test –
a. Where is the exposure?
Map emissions, facilities, suppliers, customers and financed activities by geography and business line. Portfolio-level averages can hide concentrated vulnerabilities.
b. What is the financial transmission channel?
Identify whether the risk reaches value through revenue, operating cost, capital expenditure, impairment, insurance, financing, tax, trade or liability.
c. What assumptions support the valuation?
Test commodity prices, carbon prices, utilisation rates, energy costs, technology adoption, policy timing and asset lives. Avoid using a single climate pathway as a forecast.
d. Is the transition plan funded?
Compare targets with approved capital expenditure, research spending, procurement contracts and management incentives. A distant target without near-term allocation is not a financial plan.
e. Is the emissions data decision-grade?
Examine reporting boundaries, Scope 3 coverage, estimation methods, verification, restatements and product-level data. Weak data should increase the uncertainty range rather than disappear from the analysis.
f. What happens under disorder?
Test abrupt policy changes, technology shocks, extreme weather, insurance withdrawal, supply-chain interruption and litigation. Orderly-transition assumptions may understate near-term volatility.
g. What action follows?
Define thresholds for engagement, repricing, covenants, hedging, reallocation or exit. Risk analysis adds little value if it does not alter a decision.
