What is the biggest threat to coral reefs?

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Tags

1. #sedimentation
2. #dynamite
3. #sewage
4. #degraded
5. #using
6. #pollution
7. #outbreaks
8. #species
9. #cyanide
10. #predatory
11. #agriculture
12. #problems
13. #overfishing
14. #practices
15. #reefs
16. #endless
17. #massive
18. #starfish
19. #factors
20. #coral
21. #being
22. #other
23. #threats
24. #invasive
25. #fishing