Thank you Francis Putz for your comment! I would put it that way: Certification is necessary, and it covers more than the sustainable allowable cut. It also includes social safeguards, legal compliance and many more. However, I would agree, that in many cases it is not sufficient to ensure a sustainable forest or plantation management. More transparency and a publicly verifiable commitment to a sustainable management, e. g. by disclosing forest monitoring data (Open Data Approach), might support the awareness process towards more sustainability.