Weyerhaeuser Co was incorporated in the state of Washington in January 1900. It is a real estate investment trust. The Company is a private owner of timberlands. It owns or controls nearly seven million acres of timberlands in the U.S., and manages additional timberlands under long-term licenses in Canada. It manages these timberlands on a sustainable basis in compliance with internationally recognized forestry standards. It is also a manufacturer of wood and specialty cellulose fibers products, and develops real estate as a builder of single-family homes. Its segments include Timberlands, Wood Products, and Cellulose Fibers. Its Timberlands segment grows and harvests trees for use as lumber, other wood and building products and pulp and paper, exports logs to other countries where they are made into products, plants seedlings to reforest harvested areas using effective regeneration method for the site and species, monitors and cares for the new trees as they grow to maturity, and seeks to sustain and maximize the timber supply from its forestlands while keeping the health of its environment a key priority. Its Wood Products segment provides softwood lumber, engineered lumber, structural panels and other specialty products to the residential, multi-family and light commercial markets, sells its products and services through its own sales organizations and distribution facilities as well as building materials that it purchases from other manufacturers, sells certain products into the repair and remodel market through the wood preserving and home-improvement warehouse channels, and exports its softwood lumber, oriented strand board (OSB) and engineered building materials to Asia. Its Cellulose Fibers segment provides cellulose fibers for absorbent products in markets around the world, works closely with its customers to develop specialized applications, manufactures liquid packaging board used for the production of containers for liquid products, and is energy self-sufficient, with 80 percent of its energy derived from black liquor produced at the mills and biomass. The Company's products face competition from substitutes for wood and wood-fiber products. In the United States, regulations established by federal, state and local governments or agencies to protect water quality and wetlands could affect future harvests and forest management practices on some of its timberlands.