The pace of regulatory change coming out of the European Union in late 2025 is quite substantial. The core framework for corporate environmental accountability, centred on the Corporate Sustainability Reporting Directive (CSRD) and the European Sustainability Reporting Standards (ESRS), is undergoing a profound transformation. This dual process - simplifying reporting standards while simultaneously redefining regulatory scope - aims to alleviate administrative burden without compromising the core objectives of the EU Green Deal.

For companies operating within or supplying the EU market, understanding these integrated changes - particularly the Omnibus initiative, the simplified ESRS, and evolving trends in Greenhouse Gas (GHG) accounting - is critical to maintaining compliance and strategic foresight.

The CSRD Context: Scope and the Omnibus Package

The CSRD established the requirement for large companies to report on their sustainability impacts, risks, and opportunities. Wave 1 companies began their reporting journey for the financial year (FY) 2024 and are continuing for FY 2025. However, the regulatory landscape is currently being reshaped by the Omnibus initiative, a set of proposals signalling major shifts in scope and obligation. Following the Parliament’s vote in favor of the Omnibus package in November 2025, trilogue negotiations have been underway to significantly raise the CSRD thresholds to 1,000 full-time equivalent employees and €450 million in turnover. This proposed change is substantial, potentially placing roughly 92% of companies out of scope.

The Omnibus is expected to conclude its legislative process with the adoption of the final legal text in late 2025 or early 2026. At the same time, the EU Ombudsman has identified procedural shortcomings in the Commission’s application of “Better Regulation” & deems them “maladministration”, calling into question its compliance with the principles of a transparent, evidence-based and inclusive law-making process. The implications for existing timelines seem quite clear if things move forward in alignment with the proposal, however: Wave 2 companies, - which were originally set to start reporting for FY 2025 - will likely have their start date pushed back to FY 2027. Furthermore, listed small and medium-sized entities (SMEs) are also likely to fall out of the CSRD’s direct scope.

The Omnibus also proposes other noteworthy changes, including the removal of EU-wide CSDDD civil liability provisions, the deletion of the review clause, and the potential scrapping of mandatory climate transition plan requirements entirely. While the scope may shrink, the advantages of accurately measuring and reporting on sustainability will remain relevant. The "trickle-down" effect is persistent, with larger CSRD-reporting companies increasingly requesting sustainability data from their smaller partners and borrowers. For smaller entities, the Voluntary SME (VSME) standard remains a key framework for aligning with investor and partner expectations, and ensure strategic planning for the future.

The Simplified ESRS: Proportionality and Focus

In parallel with the Omnibus, the European Financial Reporting Advisory Group (EFRAG) has finalised and delivered its technical advice to the European Commission regarding the Amended European Sustainability Reporting Standards (Amended ESRS). These standards, officially unveiled in Brussels on 4th December 2025, represent a comprehensive effort to simplify the reporting process based on lessons learned from "Wave 1" reporters on FY 2024. The core achievement of the Amended ESRS is a significant reduction in mandatory datapoints by 61% compared to the initial ESRS adopted in 2023. The formal adoption of the revised ESRS Delegated Act is expected in 2026, contingent upon the adoption of the Omnibus proposals, with companies likely applying them for FY 2027 reporting.

The Technical Frontier: Rethinking GHG Accounting

Beyond the regulatory framework adjustments, there is an ongoing and critical debate regarding the fundamental methodology underpinning corporate climate disclosures, particularly concerning Greenhouse Gas (GHG) accounting. A core challenge in current corporate GHG accounting practices, such as the GHG Protocol’s corporate standard, is the failing attempts to apply Life Cycle Assessment (LCA) thinking to an entire organization. This approach, particularly visible in the treatment of Scope 3 (value chain) emissions, leads to a host of problems that undermine the reliability and utility of reported data.

Key issues with the current expansive Scope 3 model include:

• Lack of Comparability: Existing protocols produce corporate reports that are, by design, often not comparable across companies. This stems from the enormous flexibility given to companies in setting their accounting boundaries and selecting indirect emission sources to include.
• Ambiguous Boundaries and Completeness: The requirement for a "complete" or "full" value chain inventory is impractical, as the boundaries of a value chain are often subjective and theoretically limitless (infinite progress and regress). The simplistic tiered model used in guidance (e.g., Tier 1, Tier 2 suppliers) fails to capture the complexity of real, interconnected, and looping supply chain networks.
• Temporal Confusion: Scope 3 reporting mixes past, current, and future predicted emissions, often reporting multi-year cumulative life cycle emissions under the single year in which a financial transaction occurred. This approach fails to produce the consistent time series necessary for reliably tracking performance or target progress over time.
• Rampant Double Counting: By design, the same unit of emissions can be reported under Scope 3 by every company along a value chain (non-exclusive allocation). This duplicative counting inflates the proportional importance of Scope 3 relative to Scopes 1 and 2, and dilutes effective responsibility - a problem encapsulated by the maxim that when everyone is accountable for everything, no one is really accountable.

The future trend in GHG accounting points toward demanding more rigorous definitions, harmonization and clarity on purpose. Reforms are needed to achieve comparable reporting, exclusively assign emissions to subjects (avoiding duplication), establish unambiguous boundaries, and move towards quantification methods that produce physically meaningful and consistent time series estimates. Ultimately, the effort companies currently dedicate to producing large, often incomparable, Scope 3 inventories could be more effectively redirected towards using consequential GHG accounting methods to quantify the actual avoided emissions resulting from mitigation interventions in their value chains.

In essence, while the EU is simplifying the compliance burden by cutting data points and offering procedural relief through the Omnibus and Amended ESRS, the underlying technical demands for rigorous, reliable, and comparable sustainability performance data are simultaneously maturing. Companies must pivot from merely trying to meet expansive, ambiguous requirements to strategically focusing on delivering high-quality, comparable data that genuinely informs decision-making and aligns with the emerging global technical consensus.