What is the brown revolution?

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Tags

1. #known
2. #farmers
3. #gardeners
4. #through
5. #planted
6. #first
7. #improving
8. #manure
9. #human
10. #enrich
11. #being
12. #cover
13. #green
14. #revolution
15. #crops
16. #health
17. #improve
18. #brown