generate questions: 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.
In the last 40 years, how much has worldwide paper consumption risen? {sep_token} What percentage of harvested trees are used in the manufacturing of paper? {sep_token} What do many paper companies do to ensure the health of forests? {sep_token} What percentage of wood pulp comes from old-growth trees?