As there are so many types of wood, there is no certain answer to this question. The sustainability of each type depends on various factors, including how it was harvested and what kind of maintenance it requires. With that said, some woods are considered more environmentally friendly than others because they come from sustainable sources, are easy to maintain, or release fewer toxins into the environment.
Popular sustainable woods include bamboo, cork, eucalyptus, and reclaimed lumber. Bamboo is a great choice because it grows quickly and abundantly without damaging the environment. Cork is another excellent option because the bark can be harvested without harming the tree, and it's very durable and water-resistant. Check out the full guide to learn more.