A practical suggestion for making biogas is, if you take the water from a coconut, chop a potato up and soak it in that water for two or three days, it becomes very concentrated yeast. If you introduce this into the chamber, plenty of gas can be produced. You must have a system to stir the mixture inside the gas chamber. The anaerobic process takes place mostly at the bottom of the heap in the chamber, so there also needs to be a system for churning inside the chamber. I think Dr. Liu has given us the clear policy for China, will be developed in the near future.
Chinese policy is useful to developing countries in the area, on an very urgent issue.
It is useful to pass this information onto other countries. Dr Ryan has given us another alternative, the composting issue is also useful. A good question. The landfill approach is another area to discuss. Prof. Maekawa pointed out that there are other affects of landfill.