Wood FloorsEcologically speaking, wood can be the best or the worst of materials. It can be almost perfect when harvested sustainably. It's durable, it has a long life cycle, and milling can be simple and require little energy. However, wood that's not harvested sustainably can be environmentally destructive. When choosing wood floors, look for the following to ensure you're making the most sustainable choice.FSC-certified: The Forest Stewardship Council (FSC) is an independent agency that provides certification, or approval, to wood that's been harvested in a responsible manner. Think of it as wood's equivalent of organic.Local species: Wood that's been harvested locally minimizes transportation-related energy, supports the local economy and reinforces the sense of place.Hardness: The Janka scale measures the resistance of a species of wood to denting and wear. The scale ranges from 22 up to 5,000. Teak comes in at 1,000.