If a tree falls in a Weyerhaeuser forest, someone is there to hear it -- and he has a chainsaw. The forest products company produces a variety of softwood lumber and other building materials in North America. It also offers cellulose fibers products used to make paper, packaging, and textiles. The company harvests trees for its products through its timberlands division, which owns or controls 13 million acres of forest in the US and Canada. Exports account for more than 30% of the company's sales. Incorporated in 1900 as Weyerhaeuser Timber Co., the company is classified as a real estate investment trust (REIT). Nearly 70% of its sales come from the US. The company agreed to sell its cellulose fibers business to International Paper in May 2016 for $2.2 billion.