Wood is renewable, more and more trees are planted all the time. Trees need only light, water, some nutrients, air and time in order to grow. In Indonesia, for example, over 1 million acres are reforested annually. Fossil fuels, like coal and oil, take millions of years to replace. Metals, cement, plastics and brick are not renewable.
Wood is non-toxic.
In its natural form, it does not release any toxic gases or fumes into the atmosphere. A single piece of wood can be utilized many times before it loses its properties and usefulness. And, wood is still the major source of fuel in many parts of the world.