Worldwide consumption of paper has risen by 400% in the past 40 years leading to increase in deforestation, with 35% of harvested trees being used for paper manufacture. Most paper companies also plant trees to help regrow forests. Logging of old growth forests accounts for less than 10% of wood pulp, but is one of the most controversial issues.

Answer this question, if possible (if impossible, reply "unanswerable"):  What percentage of wood pulp comes from new-growth trees?
unanswerable