A Greater Bay Area (Shenzhen-Hong Kong) alliance has launched a review of carbon footprint certification certificates, covering technology, manufacturing and supply chain companies.

The alliance, formally known as the Guangdong-Hong Kong-Macao Greater Bay Area Metrology, Testing and Certification Development Promotion Alliance, is conducting a full-process retrospective review of issued certificates through document inspection, on-site audits and data verification, according to China Daily.

Yang Jiaqi, a researcher with the alliance's carbon technology committee, said the review introduces a "fourth-party verification" mechanism, adding that the signal change serves both as a constraint and a safeguard for continued compliance.

The move follows a reply from the secretariat of the Certification and Accreditation Administration of China. It also has a clear policy backdrop: a 2024 plan by the Guangdong provincial development and reform commission on pilot carbon footprint certification in the Greater Bay Area called for prioritizing products with "outstanding emission reduction contributions and strong supply chain driving effects."

In 2026, a climate disclosure standard issued by the Ministry of Finance and eight other ministries pushed greenhouse gas information disclosure from "encouraged exploration" toward "standardization," directly linking it to market access and supply chain management.

For companies that pass the review, the alliance's carbon footprint technology committee will offer specialized services, including a "climate subsidy feasibility" diagnostic that matches companies at different stages with the types of global subsidies they are eligible to apply for.

On strategic allocation, Yang said a manufacturing company seeking to enter the global carbon subsidy system typically needs to mobilize multiple upstream resources — a sovereign wealth fund channel designated internationally, a cross-border family office willing to make long-term allocations, and an industrial vehicle for joint applications with large institutions.

Cross-border subsidies require not only mutual recognition of standards but also accurate judgment based on a company's stage of development, Yang said.

The new "fourth-party verification" signal for carbon footprint certification in September will most directly affect technology, manufacturing and supply chain companies, according to the report. Smooth indicator alignment improves market efficiency, while poor alignment may create a compliance burden.