Climate Litigation and Risk: Who Pays for Climate Damage?

Ten years after the adoption of the Paris Agreement, the fight over climate responsibility has moved from the halls of diplomacy to courtrooms around the world. Climate litigation is increasingly being deployed as a device to test, enforce, and sometimes redefine climate obligations across jurisdictions. It does not replace political negotiation, regulatory reform, or market transition, but it adds a new and consequential layer to them. What began as sporadic strategic lawsuits has developed into a complex body of claims that seek to attribute responsibility for climate harm, compel stronger mitigation action, and scrutinise the adequacy of corporate decision-making.

As of 2025, more than 3,000 climate-related cases have been filed across nearly 60 jurisdictions and international or regional bodies. These cases span constitutional and human rights arguments, tort-based damages claims, challenges to government approvals of fossil fuel projects, corporate governance disputes, and emerging actions directed at financial institutions for financed emissions and transition planning. Litigation is no longer confined to protest or symbolism; it increasingly operates within mainstream legal doctrine.

This growth reflects a deeper shift in how climate change is understood within legal systems. Climate change is not only a physical hazard or a matter of regulatory compliance but is increasingly treated as a question of legal responsibility and institutional accountability. Courts are being asked to engage with attribution science, standards of causation, proportional responsibility, and evolving duties of care. In doing so, they are influencing how governments sketch policy and how investors evaluate long-term liability.

Climate litigation has the potential both to enhance accountability and clarify expectations within the transition, while also introducing fragmentation, uncertainty, and new forms of legal exposure. As the volume and sophistication of cases increase, it becomes increasingly important to examine the consequences, both positive and negative, that are still unfolding.

How Climate Litigation Operates in Practice

At its core, climate litigation seeks to convert diffuse, cumulative, and globally distributed climate harm into legally cognisable claims. In practical terms, this means persuading courts to recognise that governments, corporations, and financial institutions owe obligations that reflect both their contribution to emissions and their capacity to mitigate harm. These claims typically turn on three questions: whether a duty exists, whether a sufficient causal link can be established between conduct and climate harm, and what remedy, if any, is appropriate.

The challenge of causation has historically been the most significant barrier. Climate change is cumulative and global, and any individual actor’s contribution is fractional. Advances in attribution science are allowing this gap to be narrowed.

In the groundbreaking case Lliuya v RWE, a Peruvian farmer sought a proportional contribution from a German energy company for flood protection measures linked to glacial melt in the Andes. The court ultimately dismissed the claim on evidentiary grounds, finding the specific risk insufficiently established. However, it accepted in principle that a major emitter could bear proportional responsibility for transboundary climate harm based on its share of historic emissions. That acknowledgment alone marked a doctrinal development. It signalled judicial willingness to engage with probabilistic scientific evidence and with the concept on contribution-based liability.

More recently, claims have extended to financial intermediaries, challenging commercial banks over financed emissions and enabling climate change. This was the case in proceedings brought by the environmental organisation Milieudefensie against Dutch bank ING Group. The claim argued that the bank’s financing activities are incompatible with its obligations under Dutch civil law and international human rights standards because it has failed to adequately reduce the emissions associated with its lending portfolio.

These cases illustrate how theories of responsibility are expanding beyond direct emitters. Capital allocation, corporate governance decisions, and financing activities are increasingly being examined through the lens of climate obligations. Taken together, climate litigation functions less as a single category of lawsuit and more as a developing legal ecosystem drawing on tort law, human rights principles, corporate governance standards, and financial regulation.

The Promise and Risks of Climate Litigation

Climate litigation is frequently discussed in moral or political terms. From a broader institution-looking perspective, its significance lies in how it redistributes responsibility and scrutiny across governments, corporations, financial institutions, and investors.

The Upside: Disclosure and Risk Pricing

A central argument in favour of climate litigation is that it can clarify legal obligations where political processes have lagged or remained ambiguous.  In an era of blazing climate protection and enforcement deficits, climate litigation can be viewed as a strong authentic tool to achieve environmental protection.  

Courts increasingly interpret constitutional provisions, statutory targets, and duties of care in light of evolving climate science. In doing so, they narrow the gap between stated policy ambitions and enforceable obligations. For long-term investors and capital markets, clearer rules can reduce ambiguity. Clearer legal expectations, even demanding ones, are often easier to incorporate into risk models than shifting political commitments or delayed regulation.

Litigation can also serve as a form of institutional scrutiny. Claims targeting misleading disclosures, greenwashing, or inadequate transition strategies compel boards and executives to reassess their assumptions about future demand, stranded assets, and the alignment of capital expenditure with climate obligations. Even unsuccessful cases can trigger reputational scrutiny and shareholder pressure, encouraging organisations to reassess the credibility of their climate strategies.

Perhaps most significantly, litigation can bring into legal focus costs that have before been treated as external to corporate decision-making. Where courts show openness to recognising proportional responsibility for climate harm, as suggested in the reasoning of Lliuya v RWE, historic emissions may begin to carry clearer legal implications. Even without large damages awards, the mere recognition of liability can influence insurance pricing, credit risk assessments, and asset valuations. Over time, this process may reshape how capital is allocated across carbon-intensive sectors.

The Downside: Volatility and Fragmentation

The same dynamics that enhance accountability also introduce instability.

Climate litigation is developing unevenly across jurisdictions. Legal standards governing causation, proportional liability, and human rights obligations differ between courts. Multinational companies face a fragmented legal environment in which exposure cannot be assessed through a single doctrine.

Responsibility is also expanding beyond primary emitters. Recent claims directed at banks in the past year, often linked to financed emissions or failures in climate management, show how litigation risk can migrate along financial value chains. Increasingly, climate litigation is relevant not only to individual companies but to entire investment portfolios.

This scope of litigation may also produce wider ripple effects. An adverse judgment against a major corporate emitter could have implications beyond the immediate defendant, affecting lenders and insurers with concentrated exposure. Credit markets, reinsurance arrangements, and asset portfolios may all transmit the effects of large-scale liability. Insurance markets already offer early signals of this recalibration.

Cross-border legal tensions contribute to this complexity further. Governments accelerating fossil-fuel phase-outs may face investor-state arbitration claims under international investment treaties even as domestic courts impose stronger climate obligations. These overlapping legal pressures can create legal crosscurrents that affect both public policy and private investment.

Taken together, climate litigation is both a method of accountability and a potential source of legal and financial volatility. It can strengthen governance, improve disclosure, and encourage more accurate pricing of climate risk. At the same time, it can fragment legal standards and transmit liability exposure through interconnected financial systems.