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