1. 11720166 Shohei Iwamoto

2. Rice Wheat Corn Sugar etc.. We people eat crop everyday. Crops We eat or use only a part of them. The rest of them, bio crop waste can be used in various ways.

3. From bio crop waste we can produce Methane gas Ethanol Hydrogen etc.. These can be used as sources of energy. electric generation agrichemical medicine

4. Carbon neutral No depletion Low cost photosynthesis growth bio crop waste Electric energy CO 2 CO 2 absorption CO 2 emitted by generating electric energy is equal to CO 2 plant absorbed. There are no increment in CO 2. electric generation

5. No depletion Bio crop waste is not exhaustible resource. People grow a crop and the crop has parts we dont eat. Cf.)Oil will run out in about 42 years.

6. Low cost Bio crop waste is waste. There are many bio crop waste in the world. It is important to use the waste effectively.

7. Dependence on the season In harvest season, there is a large amount of bio crop waste but in planting season is a small amount of it. Stable electric energy supply is difficult. CropHarvest WheatOctober RiceJune SugarFebruary

8. Low energy density Bio crop waste has small weight but has a large volume. A large amount of bio crop are needed to generate electric energy.

9. The advantages and disadvantages of converting bio crop waste to electric energy Advantages : Carbon neutral No depletion Low cost Disadvantages : Dependence on the season Low energy density

10. http://www.enecho.meti.go.jp/topics/energy- in-japan/energy2010html/world/index.htm Yasuo Igarashi, Takashi Saiki, Ethanol product from rice straw, bio mass(2008), p.187

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