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