They come from a renewable resource.
They contain some recycled material.
They have a long life span.
They can be recycled at the end of their service life,
They do not contribute to indoor air pollution once installed.
Finally, many are certified by an organization that serves the various products that make up the flooring industry. While an industry organization may itself sponsor a certification program, the actual testing and certifying is usually carried out by a third-party group.