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