The Forest Stewardship Council (FSC) is an international nonprofit that certifies forests and supply chains meeting standards for biodiversity protection, indigenous rights, worker welfare, and sustainable harvest rates.
Three on-product labels exist: FSC 100% (all material from FSC-certified forests), FSC Recycled (entirely from reclaimed material), and FSC Mix (a combination of certified, recycled, and "controlled wood" sources). Chain-of-custody certification tracks material through every processor.
FSC is widely seen as the most rigorous forestry standard. Look for it on furniture, flooring, paper, packaging, and household goods.