It can be done to protect forest resources.

�@Plan felling of the woods is limited to a country to go like Finland a place of supply of the lumber .

�AA waste of the lumber is lost.
　 Loss did an end material in the process which did lumber in the square lumber for the residence no less than about 45%. Today, the epoch-making tree material which an end material was used for the raw material as is being developed. It is important to the person as well who buys it to choose the product which save resources are thought about actively.