TL;DR

Illinois, New York, and New Jersey are advancing legislation that would require large companies (>$1B in global revenue) to disclose Scope 1, 2, and 3 greenhouse gas (GHG) emissions using the Greenhouse Gas Protocol. While timelines vary slightly, initial reporting could begin as early as 2027, with third-party assurance requirements phased in thereafter.

Together with California, these states are effectively creating a state-led national standard for climate disclosure, making emissions reporting a core compliance requirement rather than a voluntary ESG exercise. Companies should begin building centralized, audit-ready data systems now—particularly for Scope 3 emissions, which are the most complex and resource-intensive to measure.

Climate Disclosure Is Becoming Business as Usual: Illinois, New York, and New Jersey Signal a Structural Shift

Climate disclosure regulation in the United States is no longer developing in isolated pockets it is beginning to take shape as a coherent, state-driven framework. Recent legislative activity in Illinois, New York, and New Jersey underscores how quickly expectations are evolving for large companies. What was once largely voluntary ESG (Environmental, Social, and Governance) reporting is now being formalized into mandatory, enforceable requirements.

Each of these states is advancing legislation that closely mirrors California’s existing approach, and together they represent a growing portion of the U.S. economy. For executive teams, this is not simply another regulatory development to monitor. It is a clear signal that greenhouse gas (GHG) emissions data is becoming a core element of corporate disclosure, with implications for governance, operations, and risk management.

A Common Blueprint Is Emerging Across States

Although Illinois (HB 3673), New York (S9072A), and New Jersey (S679) are at different stages of the legislative process, they share a remarkably consistent structure. At their core, each proposal requires large companies to disclose emissions across their full operational and value chain footprint, using the Greenhouse Gas Protocol, the globally recognized standard for emissions accounting.

To understand the scope of these requirements, it is important to clarify the three categories of emissions that companies must report. Scope 1 emissions refer to direct emissions from assets a company owns or controls, such as facilities or vehicle fleets. Scope 2 captures indirect emissions from purchased energy, including electricity and heating. Scope 3, often the most complex category, includes all other indirect emissions across the value chain—from suppliers to product use.

The inclusion of Scope 3 is particularly significant. For many organizations, these emissions represent the majority of their carbon footprint, yet they are also the most difficult to measure. Their inclusion signals that regulators are no longer satisfied with partial visibility into corporate emissions—they are pushing for a comprehensive, system-wide view of climate impact.

Broad Applicability Reflects a Global Lens

Another defining feature of these proposals is how broadly they apply. Each bill targets companies with more than $1 billion in annual global revenue that are considered to be “doing business” in the relevant state. This is not limited to local operations or in-state revenue. Instead, it reflects a regulatory philosophy that large enterprises should be accountable for their full global emissions footprint if they operate within the state’s economic ecosystem.

This approach has important implications. A company with even a modest presence in New York, Illinois, or New Jersey may still be required to report emissions at the consolidated, enterprise level. In practice, this means that compliance cannot be addressed at a regional level—it must be embedded into global reporting systems and governance structures.

New Jersey’s proposal is particularly notable in this respect. It explicitly acknowledges that companies may rely on existing disclosures prepared for other jurisdictions or international frameworks, provided they meet the state’s requirements. This reflects a pragmatic recognition that businesses are increasingly navigating overlapping regulatory regimes, and that consistency should be encouraged where possible.

Timing Signals Urgency, Not Distance

While the implementation timelines vary slightly, the overall cadence is strikingly similar across all three states. Illinois and New York are targeting initial disclosures of Scope 1 and Scope 2 emissions as early as 2027, with Scope 3 following shortly thereafter. New Jersey introduces a slightly longer runway, with reporting beginning several years after enactment and assurance requirements phasing in over time.

Despite these differences, the broader message is clear: the window for preparation is already open. Building the systems required to collect, validate, and report emissions data—particularly for Scope 3—can take several years. Companies that wait for final rules to be published will likely find themselves under significant operational pressure.

From Transparency to Accountability

Perhaps the most important shift reflected in these proposals is the move from transparency to accountability. These are not simply disclosure regimes; they are enforcement-backed regulatory frameworks. Each state contemplates the use of public reporting platforms, ensuring that emissions data will be accessible to investors, regulators, and the public.

In addition, all three states introduce some form of third-party assurance, requiring companies to have their emissions data independently verified. This is a critical development. Assurance transforms climate data from a sustainability metric into something closer to financial information—subject to controls, documentation, and audit standards.

Enforcement mechanisms further reinforce this shift. State authorities, including Attorneys General, are empowered to pursue penalties for non-compliance. In some cases, these penalties can be substantial, creating both financial and reputational risk.

What This Means for Executive Teams

Taken together, these developments point to a fundamental evolution in how climate performance is managed within organizations. Emissions data is no longer confined to sustainability reports or investor presentations. It is becoming a regulated, decision-grade dataset that must withstand scrutiny from multiple stakeholders.

For executive teams, this requires a different level of integration. Sustainability functions can no longer operate in isolation. Instead, emissions reporting must be coordinated across finance, operations, procurement, and legal teams, with clear ownership and accountability.

It also raises important strategic questions. How reliable is the organization’s current emissions data? Are systems in place to capture information across the value chain? Can the company support independent verification? And perhaps most importantly, is there a single, consistent methodology being applied across jurisdictions?

A State-Driven National Standard in Practice

Although these laws are being developed at the state level, their collective impact is national in scope. California, New York, New Jersey, and Illinois together represent a substantial share of U.S. economic activity. For large companies, compliance with these frameworks will effectively establish a baseline standard across the entire organization.

This is how regulatory convergence often occurs—not through a single federal mandate, but through the alignment of multiple influential jurisdictions. Over time, this creates a practical standard that companies must follow regardless of where they are headquartered.

Closing Thought: From ESG Initiative to Core Business Requirement

The direction of travel is unmistakable. Climate disclosure is moving out of the realm of voluntary ESG initiatives and into the core of regulatory compliance. For organizations that have already invested in emissions tracking and reporting, these developments may represent a natural progression. For others, they signal the need for a more fundamental transformation.

The companies that respond most effectively will be those that treat this not as a compliance burden, but as an opportunity to build robust, scalable, and credible data systems. In doing so, they will not only meet regulatory expectations but also strengthen their position with investors and stakeholders in a market that increasingly values transparency and accountability.