The End of Voluntary ESG: The New Era of Corporate Climate Litigation
- 3 days ago
- 5 min read
Climate litigation and ESG regulations are redefining the legal framework of corporate governance and creating a new horizon for businesses.
A recent, pivotal report by the World Economic Forum (WEF) highlights that climate litigation has matured into a systemic business risk, with direct implications for corporate strategy, governance, and capital allocation. This shift was recently analyzed by Professors Gabriel Wedy and Ingo Wolfgang Sarlet in Conjur, where they noted that the climate has shifted from a mere political backdrop to an autonomous source of legal risk.
This context of shifting climate legal regimes and corporate sustainability is the focus of my doctoral research at the University of São Paulo (FD/USP). Broadly, I investigate how ESG duties are transitioning from voluntary practices (soft law) to binding legal obligations (hard law) in Brazil.
In previous analyses, I have highlighted the rising legal, regulatory, and economic impacts of corporate climate litigation—particularly when court rulings, pleadings, or causes of action integrate duties from climate treaties and standards into corporate ESG benchmarks.
Below, I share key insights into this intersection and what it means for the future of corporate governance:
1. The Global Landscape: What do the numbers say?
Data confirms this rising trend. According to the Global Trends in Climate Change Litigation (Grantham/LSE), over 80% of new climate cases in 2024 were classified as strategic, meaning they aim to influence public debate or force changes in corporate behavior. Approximately 20% of these cases targeted companies or their directors. The UNEP report, "Climate Change in the Courtroom," reinforces that litigation is empowering civil society to compel the private sector to adopt concrete targets. Notably, Brazil now ranks fourth globally in the number of climate-related cases.
2. The New Frontier: Value Chain Responsibility
It is no longer enough to look only at a company’s own Greenhouse Gas (GHG) emissions. Climate litigation is undergoing a fundamental shift: the focus is moving from those who emit to those who enable emissions. As Wedy and Sarlet pointed out, this decisively impacts the structures, functions, and duties of corporate governance.
ESG/Climate Risk = Legal Risk: Companies are increasingly exposed to legal scrutiny for what they finance, facilitate, or fail to prevent within their networks of suppliers, distributors, and end-users.
Due Diligence as a Structural Obligation: This transforms due diligence into a mandatory structural requirement, forcing companies to identify and mitigate climate risks throughout their entire value chain.
3. The End of Soft Law and Financial Rigor for Climate
The era of purely aspirational climate promises is over. Sustainability pledges and net-zero targets are now being treated as legal representations that create enforceable duties of both "conduct" and "result."
Corporate ESG Legal Duty: Regulatory and investor tolerance for greenwashing is evaporating. Discrepancies in these statements can constitute a breach of transparency duties and a failure to properly inform investors and consumers.
A New Standard: The practical recommendation from both the WEF and legal doctrine is clear: sustainability and climate disclosures must be handled with the same governance, rigor, and factual basis as financial reports.
4. The New Fiduciary Duty of Boards of Directors
Climate change can no longer be treated as a mere "negative externality" or a distant concern. It must be at the heart of investment decisions and project approvals. Boards and executives are now expected to demonstrate that they have prudently assessed physical and transition risks, alongside the ESG impacts of their business operations.
Failure of Diligence: Maintaining climate transition plans that are purely rhetorical—without integration into governance structures or capital allocation (Opex, Capex, etc.)—may constitute a clear failure of management diligence.
Legal Implications: This is a central premise for analyzing the "social (and climate) function" of a company under the Brazilian Corporations Act (Law No. 6.404/1976). It also challenges outdated applications of the "business judgment rule" when directors make decisions without minimal climate due diligence.
Market Impatience: A clear example occurred recently in the oil and gas sector. BP's management attempted to relax its internal climate transparency rules, citing "regulatory redundancy." The proposal was resoundingly defeated by shareholders. Major asset managers sent a clear message: they will not tolerate a lack of clarity on energy transition risks, proving that the market already prices omission as an unacceptable fiduciary risk.
5. The "Public Turn" in Corporate Law
The shift in corporate governance goes beyond new market rules; it reflects a structural transformation in business law itself. As Gabriela Junqueira argues in her recent USP doctoral thesis, we are witnessing a "public turn" in contemporary corporate law.
The traditional neoliberal premise of shareholder primacy (where governance serves exclusively to maximize shareholder value) is being dismantled in the face of risks that threaten the very "corporate purpose" of companies. Corporate law is being leveraged for public ends, internalizing climate mitigation as a structural duty rather than a peripheral factor.
6. Theory in Practice: Corporate Litigation in the Courts
To illustrate how this regulatory "hardening" is manifesting in the judiciary, here are three landmark cases every executive should watch:
Commonwealth of Massachusetts v. Exxon Mobil Corp. (USA): The state accused Exxon of investor fraud for using misleading "carbon costs" in sustainability reports to appease ESG investors. Lesson: Polished climate disclosures that lack factual backing lead to severe legal liability.
ASIC v. Vanguard Investments (Australia): The Australian regulator successfully secured a multi-million dollar fine ($12.9M AUD) against Vanguard for greenwashing. The court found that a significant portion of its "Ethically Conscious" fund lacked the ESG screening it promised. Lesson: Sustainable investment theses must be applied to the portfolio, not just the marketing brochure.
Kim Min et al. v. Kim Tae-Hyun et al. (South Korea): Directors of the National Pension Service (NPS) were sued for failing to implement a coal phase-out policy. While the court rejected damages, the ruling served as a warning: executives have an institutional duty to consider ESG factors and can be held liable if their decisions negate public climate commitments.
7. Regulatory "Hardening": From Voluntary to Mandatory
We are witnessing the "hardening" of ESG and climate norms. Soft law standards are being converted into binding legal obligations with high levels of oversight and sanction.
European Union: The CSDDD (Corporate Sustainability Due Diligence Directive) sets a global gold standard for mandatory due diligence. Meanwhile, the CSRD (Corporate Sustainability Reporting Directive) institutionalized "double materiality," requiring companies to report both how the climate affects them and how they affect the planet.
Brazil: National regulators are consolidating strict obligations:
CVM (SEC): Resolution 193/2023 made Brazil a pioneer in adopting ISSB (IFRS S1 and S2) standards, requiring sustainability reports with the same rigor as financial statements.
Central Bank (BACEN): Resolution 4.945/2021 mandates Social, Environmental, and Climate Responsibility Policies (PRSAC) for financial institutions.
SUSEP (Insurance): Circular 666/2022 established mandatory ESG requirements for the insurance and reinsurance markets.
8. The Hardening of Obligations via International Courts
International tribunals are reinterpreting historically non-binding conduct as fundamental legal obligations. Three recent milestones have redefined state—and by extension, corporate—responsibility:
Inter-American Court of Human Rights (OC-32/24): Ruled that states have an inexcusable duty to regulate and oversee corporate activities that worsen global warming.
International Court of Justice (2025 Advisory Opinion): Consolidated "due diligence" as a positive obligation for states to adopt rigorous measures to control private sector emissions.
ITLOS (May 2024): The International Tribunal for the Law of the Sea classified GHG emissions as marine pollution, making polluting companies the legal source of "international illicit pollution."
Summary
The private sector's response to the climate crisis has evolved from a marketing strategy into a strict matter of legality and the protection of the corporate purpose.
As precedents show, informed inertia is no longer a valid option. Those who treat climate as a peripheral variable risk having their strategic decisions and capital allocations stripped down in court under new standards of diligence that do not tolerate omission.
The integration of climate risk into core governance and financial decision-making (Opex and Capex) is now the most significant strategic differentiator for protecting long-term value.
The question remains: Are Brazilian boards ready to treat climate risk with the same depth as traditional legal and financial risks?
Time—and the courts—will tell.
_
[Automatically translated]
Originally published on LinkedIn.
Author: Bruno Teixeira Peixoto
Comments