At present, addressing climate change is one of the most prominent global issues in the international community. From the G8 summit to the Davos Forum, from the G20 summit to the Copenhagen Conference, "addressing climate change and developing a low-carbon economy" is almost a topic that must be discussed at every meeting, and its core issue is carbon emissions. Reducing carbon dioxide emissions and developing a low-carbon economy have become important goals for China's economic and social development. At the 2010 Central Economic Work Conference, China explicitly stated the need to "promote energy conservation and emission reduction, strengthen the responsibility system for energy conservation and emission reduction targets, strengthen the construction of key energy conservation and emission reduction projects, carry out low-carbon economy pilot projects, strive to control greenhouse gas emissions, strengthen ecological protection and environmental governance, and accelerate the construction of a resource-saving and environmentally friendly society. On November 26, 2009, China officially announced its action goal to control greenhouse gas emissions, deciding to reduce carbon dioxide emissions per unit of GDP by 40% to 45% compared to 2005 by 2020.
  The establishment of a low-carbon certification system is an important technical support and basic measure for implementing the national low-carbon economic development strategy. Since the 1990s, in the context of a market economy, the implementation of quotas and emissions trading has been a means and measure of global "common emission reduction" promoted internationally. The operation basis of "quotas and emissions trading" is an "open, fair, and equitable carbon emission evaluation system". Whether it is the Clean Development Mechanism (CDM) and Joint Implementation Mechanism (JI) under the United Nations Framework Convention on Climate Change, the mandatory emissions trading system ETS of the European Union, or the international voluntary emission reduction mechanisms VCS, CCX, etc., they are all based on the establishment of a relatively complete certification and accreditation system, which uses third-party institutions for specific evaluation and authoritative organizations to audit the capabilities of third-party institutions, certification institutions, and accreditation. Institutions play an important role as third parties and authoritative institutions. The objective evaluation of carbon emissions from countries, entities, projects, products, and services has become the foundation for effective control and management of greenhouse gas emissions in various countries.