Across
- 1. safety
- 6. drill
- 7. well
- 9. bronze
- 13. rubber
- 18. pedestrian
- 20. hitchhike
- 21. stainlesssteel
- 23. hammer
- 24. overtake
- 26. driverless
- 28. energy
- 29. coal
- 30. stone
- 31. tyre
Down
- 2. manufacturing
- 3. polluting
- 4. concrete
- 5. clutch
- 8. iron
- 10. renewable
- 11. earthquake
- 12. geothermal
- 13. reverse
- 14. bumper
- 15. windscreen
- 16. campaigner
- 17. tunnel
- 19. pressure
- 22. length
- 24. organic
- 25. thick
- 27. swerve