The use of CO2-eq in the European Union's emission trading system is a widely accepted method for measuring greenhouse gas emissions, including CO2 emissions, which are the main contributor to global warming. However, it is not the only metric that could be used, and some argue that other measures of pollution may also be necessary to provide a more comprehensive picture of environmental impact.

Ultimately, the effectiveness of the EU's emission trading system in reducing emissions and promoting sustainability depends on various factors, such as the design of the system, the level of penalties and incentives, and the ability to monitor and enforce compliance. While CO2-eq is a useful tool, the system may need improvement in order to fully address the issue of pollution and promote sustainability.
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