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