Genshu's causes

1. Demographic explosion
2. Growth of industry
3. Poverty
4. Waste of water
5. War
6. Government problem
7. Using too much detergent
8. Chemical fertilizer
9. Much trash
10. Oil
11. Shortage of sanitary
12. Mining
13. Nuclear weapon station
14. Drought
15. Flood
16. Bacterium
17. Construction
18. Chemical substances
19. Abnormal climate