1. barrel
  2. barrel
  3. recycle
  4. earth
  5. recycled bag
  6. dumpster
  7. bio
  8. plug
  9. plant
  10. battery
  11. water
  12. industry
  13. biofuel
  14. eco house
  15. biology
  16. earth
  17. water
  18. biology
  19. sprout
  20. biogas
  21. energy
  22. ocean energy
  23. hydro power
  24. solar panel
  25. leaf
  26. factory
  27. light bulb
  28. electric bike
  29. light bulb
  30. eco factory
  31. solar
  32. electric tower
  33. hydro power
  34. water
  35. rain
  36. socket
  37. energy
  38. windmill
  39. save
  40. battery
  41. lamp
  42. magnet
  43. factory
  44. wind
  45. chemical
  46. biofuel
  47. storm
  48. light bulb
  49. hydro power
  50. electric car
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