Sorry, no online dictionaries contain the exact phrase non-polluting energy source.
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Reverse dictionary results:
1. atom
2. sun
3. steam
4. glucose
5. fuel
6. coal
7. gas
8. oil
9. oilfield
10. dynamo
11. atomic age
12. coalfield
13. sol
14. electromotive force
15. quasar
16. perpetual motion
17. biomass
18. decay
19. emf
20. uranium
21. protein
22. active
23. burn
24. cab
25. engine
26. miami
27. motive power
28. nuclear power
29. petroleum
30. plasma
31. power
32. powerhouse
33. principle
34. pump
35. radiation
36. renewable
37. solar
38. supply
39. wind
40. windmill

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You can look up the words in the phrase individually using these links:   non-polluting ?   energy ?   source ?
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