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