Glass substrate manufacturers, for example, are extremely reluctant to publish carbon data because fuel and power comprise such a large proportion of their costs that providing carbon data would be equivalent to revealing their entire cost structure. Some large Japanese firms that supply chemical products (e.g. photoresists) face similar difficulties.
例如玻璃基板，由於成本中用電量和燃料所占的比例極高，一旦提供數據，就形同公開了成本，某些日本大廠供應的化學品（如光阻）也有同樣問題。