What was the Climate Corporate Accountability Act?

Quick Answer: The Climate Corporate Accountability Act (Senate Bill 260) was a California legislative proposal that would have required large US companies doing business in the state to publicly disclose their full greenhouse gas emissions across Scope 1, 2, and 3 categories. Senator Scott Wiener introduced the bill in 2021; it passed the California Senate but failed to pass the Assembly in August 2022. Although SB 260 did not become law, it directly shaped the successor legislation that did: SB 253, which Governor Gavin Newsom signed into law in 2023.

What was the Climate Corporate Accountability Act?

The Climate Corporate Accountability Act (Senate Bill 260) was a California bill that proposed mandatory, verified greenhouse gas emissions reporting for large corporations operating in the state. Senators Scott Wiener and Henry Stern introduced it on 26 January 2021.

The bill targeted US partnerships, corporations, limited liability companies, and other business entities with total annual revenues exceeding $1 billion that do business in California. The bill defined these organisations as "reporting entities."

Under SB 260, reporting entities would have been required to disclose Scope 1, 2, and 3 greenhouse gas emissions annually, with independent verification by an approved third-party auditor. The bill would have made disclosures publicly available through an emissions registry, accessible to California residents.

Who would SB 260 have applied to?

The applicability threshold in SB 260 was straightforward in principle: any US business entity with over $1 billion in annual revenue that does business in California.

"Doing business in California" carries a specific legal meaning under California law. It covers companies incorporated elsewhere but actively operating in the state, not just those headquartered there. Given California's position as the fifth largest economy in the world, this definition would have brought a significant number of major US corporations into scope.

The bill did not apply to smaller companies or those with no California operations, but the $1 billion revenue threshold targeted the largest corporate emitters, whose supply chains and operations account for a disproportionate share of total greenhouse gas emissions.

What did SB 260 require companies to report?

SB 260 required full-scope emissions disclosure, covering all three categories under the GHG Protocol:

• Scope 1: Direct emissions from sources owned or controlled by the reporting entity (for example, fuel combustion in company vehicles or on-site manufacturing processes).
• Scope 2: Indirect emissions from purchased electricity, heat, or steam consumed by the reporting entity.
• Scope 3: All other indirect emissions across the value chain, including supplier emissions, employee commuting, business travel, product use, and end-of-life disposal.

Practitioners widely regard Scope 3 as the most complex category to measure accurately. For most companies, it represents the largest share of their total footprint, often exceeding 70% of total emissions. SB 260 recognised this complexity by requiring the California Air Resources Board (CARB) to review Scope 3 reporting deadlines by January 2029 and adjust them if necessary based on trends in reporting practice.

All disclosures would have required independent verification by an auditor approved by the state board, with demonstrated expertise in greenhouse gas emissions accounting.

What were the penalties for non-compliance?

SB 260 included a graduated penalty structure for reporting entities that failed to meet their obligations:

• Late or incomplete disclosure: An administrative penalty of $25,000 per day for the first 30 days of non-compliance, rising to $50,000 per day thereafter.
• Repeated or intentional violations: A civil penalty of up to $1,000,000 per violation, which the California Attorney General would assess and recover through civil action brought in the name of the people of the State of California.

The Secretary of State, in consultation with CARB and the Attorney General, would have adopted enforcement regulations. The bill explicitly authorised the Attorney General to bring civil actions against non-compliant reporting entities.

Why did SB 260 fail, and what replaced it?

SB 260 passed the California Senate in January 2022 with a vote of 23 to 7. It then progressed through several Assembly committees, but failed to pass on the Assembly floor on 31 August 2022. The Assembly returned it without further action on 30 November 2022, effectively ending its legislative life.

Opposition centred on concerns about the compliance burden, particularly around Scope 3 reporting, and the readiness of supply chains to provide the data required. Political resistance from business groups also played a role in its failure to secure enough Assembly votes.

The bill's failure was not the end of the policy direction it represented. In October 2023, Governor Gavin Newsom signed SB 253 (the Climate Corporate Data Accountability Act) into law. SB 253 closely mirrors the framework that SB 260 proposed, applying to companies with over $1 billion in annual revenue doing business in California and requiring full Scope 1, 2, and 3 disclosure with third-party verification. SB 253 is the operative legislation companies need to understand and prepare for today.

How does SB 260 relate to the broader US climate disclosure landscape?

SB 260 offered an early signal of where corporate climate accountability regulation was heading, both at state and federal level. Its proposal of mandatory, verified, full-scope emissions disclosure for large companies preceded similar frameworks that have since advanced significantly.

At the federal level, the US Securities and Exchange Commission (SEC) finalised climate disclosure rules in March 2024, though these have faced legal challenges. The California legislation (SB 253 and the companion bill SB 261, which requires climate-related financial risk disclosure) is currently more advanced in implementation than the federal rules.

For companies already working toward GHG Protocol-aligned reporting, the shift from voluntary disclosure to mandatory, verified reporting requires a more rigorous approach to data quality, particularly for Scope 3 categories. This means auditable data sources, documented assumptions, and consistent methodology year on year.

Seedling's carbon accounting platform centres on GHG Protocol alignment, with full Scope 1, 2, and 3 measurement and independently assured outputs. For companies preparing for SB 253 or similar mandatory disclosure requirements, that foundation matters more than ever.