AB 1305 is about voluntary carbon market disclosures and climate-claim evidence. SB 253 is a large-company greenhouse-gas disclosure framework. Sellers should keep customer data, public claims and offset evidence separate.
Data review date: 2026-08-10. This article is based on California Legislative Information bill texts for AB 1305 and SB 253. It is a preparation guide only and does not promise regulatory, platform, certification, ranking, traffic or sales outcomes.
Cross-border sellers often hear about these laws through a brand ESG questionnaire or a marketing request to use phrases such as carbon neutral, net zero or climate friendly. The mistake is to treat customer data, public consumer claims and carbon-offset records as one file.
Customer Scope 3 data is normally an input for the customer’s reporting system. It is not automatically public marketing proof for the supplier. A product page claim needs its own boundary: covered product, time period, emissions scope, accounting method, verification status and offset project information where relevant.
Classify the request first
- Customer data request: define data boundary, source, version and intended use.
- Public page claim: inventory every climate or environmental phrase and map it to evidence.
- Offset-related record: identify project source, quantity, period, third-party information and covered object.
Before wording is improved, claims need to be triaged into cannot write, write only with a narrower boundary, and write after evidence is complete. Marketing should not carry this alone; procurement, factory data owners, finance or administration, compliance and management all hold part of the record.
Greenark Certification (Shenzhen) Co., Ltd. recommends starting with a claim inventory before rewriting listings, packages or websites.
Greenark Certification (Shenzhen) Co., Ltd.
For review work, prepare the SKU list, reports, certificates, page screenshots and supplier declarations before deciding what can be stated publicly.
