Read this: The Earth contains about 434 billion cubic meters of growing stock forest, 47% of which is commercial. As an abundant, carbon-neutral renewable resource, woody materials have been of intense interest as a source of renewable energy. In 1991, approximately 3.5 cubic kilometers of wood were harvested. Dominant uses were for furniture and building construction.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What percentage of the Earth's stock forest is commercial?
47%