Greenpeace is withdrawing from the main global group for certifying sustainable wood products, saying it is failing to protect natural forests from exploitation.
Greenpeace, a founding member of the Forest Stewardship Council, said it "fell short" of its goals of conserving forests and benefiting society.
The FSC mark, a stylized tree, is sought by paper producers and other wood users as an endorsement they can use in the marketplace to promote their products as sustainable.
Greenpeace said in a statement on its website that the council has become a "tool for forestry and timber extraction."