Let's take the example of agricultural fibres. We're trying to use flax hay to produce flax fibres. In Canada, flax is harvested for its seeds. We use flax seed in different industries, and even in food. When we extract the seeds, we are left with bales of flax hay, which can be re-used to extract fibres. These fibres could be compared with wood fibres, which are used in different materials such as bio-composites. In Canada, we don't only grow flax for its seeds, but we could go further and extract its cellulosic fibres. It's the same thing for hemp and wood fibre. There is currently a huge supply of wood fibre, because it is a by-product of the paper and pulp industry.
On February 6th, 2018. See this statement in context.