It is estimated that the annual sawdust pile of the world would be several times as large as the largest skyscraper of New York. The sawdust is only about one-fifth of the total waste from the lumber industry. It is estimated that 62 percent of each tree cut for lumber is wasted. This includes the limbs, top, and stump as well as the waste at the mill. From the sawlogs alone the waste is approximately 49 per cent.
Arnold, Lionel K.
"Wood Waste as a Raw Material,"
Ames Forester: Vol. 18
, Article 3.
Available at: https://lib.dr.iastate.edu/amesforester/vol18/iss1/3