1. Growing trees is not very manpower intensive.
2. The modern paper process prefers tree fibers. Since tree cells need to be more rigid they contain more cellulose. Paper used to be made from linen, cotton and hemp (textile fibers), but modern paper is cheaper although not as durable (because the modern paper process leaves a lot of acid in the paper, which means the paper becomes brittle after only a few years).
3. The trees preferred for paper (pine&spruce) grow pretty fast. The kind of wood used in papermills might be from a tree that took just 10-20 years to grow to full height (which makes the timbers too soft&weak for construction).
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