1. co
  2. electricity
  3. gas
  4. water
  5. socket
  6. tower
  7. iceberg
  8. whale
  9. book
  10. battery
  11. shirt
  12. lightbulb
  13. greenhouse
  14. settings
  15. paper
  16. sun
  17. recycle
  18. tree
  19. flask
  20. factory
  21. rain
  22. plant
  23. growth
  24. stump
  25. greenhouse
  26. barrel
  27. light
  28. battery
  29. windmill
  30. plant
  31. flower
  32. rose
  33. ecology
  34. bicycle
  35. ecology
  36. ecology
  37. faucet
  38. paper bag
  39. toilet paper
  40. nuclear
  41. price tag
  42. recycle bag
  43. save water
  44. eco fuel
  45. green energy
  46. global warming
  47. electric car
  48. recycle bin
  49. shopping bag
  50. solar panel
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