1. trash
  2. tree
  3. energy
  4. barrel
  5. science
  6. dam
  7. gasoline
  8. biogas
  9. energy
  10. magnet
  11. socket
  12. charging
  13. accumulator
  14. totebag
  15. ecology
  16. hydro power
  17. green energy
  18. plastic bag
  19. recycling bin
  20. solar panel
  21. energy
  22. lamp
  23. lamp
  24. lamp
  25. lamp
  26. plant
  27. dam
  28. factory
  29. ho
  30. windmill
  31. windmill
  32. hydro
  33. world
  34. bio
  35. thunder
  36. tank
  37. sun energy
  38. battery status
  39. wind socket
  40. geothermal energy
  41. plant
  42. leaf
  43. leaf
  44. biofuel
  45. hydro power
  46. bio energy
  47. gas station
  48. hydro
  49. energy
  50. atom
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