What proof levels mean in Sustainable Units

Strong sustainability research starts by separating the claim from the proof. A brand statement can be useful, but it is not the same as public documentation, certification, reviewed documents, or third-party audit evidence.

Sustainable Units scores are editorial assessments based on available information unless verified. The goal is to make comparison easier while keeping uncertainty visible.

For any important purchasing, classroom, workplace, or procurement decision, use the directory as a starting point for better questions and check current documentation directly from the original source.