This is especially true in the US where the article says they are sourcing from. US forest cover has been increasing for years as marginal farm land is reclaime

This is especially true in the US where the article says they are sourcing from. US forest cover has been increasing for years as marginal farm land is reclaimed by trees - intentionally or otherwise - http://www.fao.org/3/x4995e/x4995e.htm http://www.fao.org/3/x4995e/x4995e.htm