Every year on 22 April, Earth Day serves as a global reminder of our collective responsibility toward the planet. It is a moment to reflect — not only on what we do, but on how we measure, report and account for it. For the IRE and its members, Earth Day 2026 is an opportunity to highlight a fundamental truth: a sustainable future requires more than good intentions. It requires reliable, transparent and independently verified information.

From Commitment to Credibility

Across the world , companies, funds, financial institutions and public bodies are increasingly publishing sustainability-related information — covering climate impact, social responsibility, governance practices and more. This information guides decisions made by investors, lenders, regulators, employees and citizens alike.

But data without assurance is simply a claim.

This is where the réviseur d'entreprises — the statutory auditor — plays a critical and evolving role.

A Changing Landscape: CSRD, SFDR and Beyond

The regulatory environment around sustainability reporting has shifted significantly in recent years:

• The Corporate Sustainability Reporting Directive (CSRD) broadens the scope of companies required to report on sustainability matters under the European Sustainability Reporting Standards (ESRS), and introduces a mandatory requirement for independent assurance on that sustainability information.
• The Sustainable Finance Disclosure Regulation (SFDR) requires financial market participants to disclose how sustainability risks and impacts are integrated into their processes and products — creating a growing demand for reliable underlying data.
• Beyond these frameworks, companies report on a wide range of sustainability KPIs — carbon emissions, energy consumption, diversity metrics, supply chain practices — that increasingly require the same rigor and independent scrutiny applied to financial information.

The common thread across all of these is clear: quality assurance is the backbone of credible sustainability reporting.

The Role of the Réviseur d'Entreprises

The profession of réviseur d'entreprises is to build trust on the principles of independence, objectivity, professional skepticism and competence — precisely the qualities that sustainability assurance demands.

As assurance providers, auditors can:

✔ Verify that sustainability reporting is complete, accurate and consistent;

✔ Challenge the assumptions and methodologies underlying reported data;

✔ Provide stakeholders with independent assurance in the information presented;

✔ Contribute to reducing the risk of greenwashing and misleading disclosures.

In Luxembourg — as a leading financial center and jurisdiction for investment funds, listed companies and multinational groups — the quality and credibility of sustainability disclosures has real implications, both for market integrity and for Luxembourg's reputation as a responsible and well-regulated financial hub.

Building the Profession for a Sustainable Future

The IRE and its members, the réviseurs d’entreprises, are actively engaged in preparing the audit profession for the expanding role they play in the sustainability space. This includes:

• Ongoing training and professional development in sustainability assurance methodologies and standards (including ISAE 3000, future ISSA 5000 and related frameworks);
• Engagement with European and international standard-setters;
• Technical guidance and support to members navigating the evolving regulatory landscape;
• Organizing ESG Conferences;
• The work of the IRE ESG Committee, which monitors developments and provides practical insights to the profession.

We are committed to ensuring that Luxembourg's audit profession is ready — technically and ethically — to meet the challenge that credible sustainability reporting demands.

A Message for Earth Day

On this Earth Day, we invite companies, investors and stakeholders to reflect on a simple but important question:

Behind the sustainability data you rely on — Is this information reliable?

In a complex and evolving environment, sustainability reporting can only be meaningful if the underlying data is reliable. Assurance plays a critical role in reinforcing trust, accountability, and confidence in sustainability information. Transparency is not just a reporting exercise — it is an act of accountability. The IRE stands ready to support this mission.

For more information on sustainability assurance and the work of the IRE ESG Committee, please contact the IRE Secretariat.