1. Law concerning special measures to promote the use of new energy; 25 January 2002.
2. Outline for promotion effects to prevent global warming. Japan: Ministry of Environment; March 2002.
3. Biomass nippon strategy. Japan: Cabinet Council of Japan, Forestry and Fisheries; December 2002.
4. Basic plan for forest and forestry. Japan: Forest Agency; October 2001.
5. Renewables portfolio standard law; 7 June 2002.