Why is Switzerland so clean?

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Tags

1. #investment
2. #cleanliness
3. #perception
4. #litter
5. #costs
6. #switzerland
7. #countries
8. #production
9. #sanitation
10. #about
11. #waste
12. #likely
13. #every
14. #other
15. #lower
16. #cities
17. #clean
18. #million
19. #efforts
20. #chf200
21. #swiss