1. electric bike
  2. plant
  3. ho
  4. light bulb
  5. eco factory
  6. lamp
  7. lamp
  8. energy
  9. science
  10. plant
  11. tank
  12. atom
  13. solar
  14. electric tower
  15. hydro power
  16. plastic bag
  17. water
  18. rain
  19. wind socket
  20. solar panel
  21. socket
  22. energy
  23. windmill
  24. save
  25. battery
  26. lamp
  27. magnet
  28. factory
  29. wind
  30. barrel
  31. dam
  32. factory
  33. windmill
  34. hydro
  35. magnet
  36. socket
  37. thunder
  38. hydro
  39. energy
  40. chemical
  41. biofuel
  42. biofuel
  43. storm
  44. light bulb
  45. hydro power
  46. hydro power
  47. sun energy
  48. hydro power
  49. electric car
  50. geothermal energy
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