What makes a great City?

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Across
  1. 1. free from dirt,
  2. 3. free from danger,
  3. 4. a wide variety of plant and animal species, in their natural environments,
  4. 5. continual reuse,
  5. 6. easy to move around,
  6. 8. elements of the natural world,
  7. 9. areas of land for public enjoyment,
  8. 11. variety or difference,
  9. 13. an activity that occupies a person's time,
  10. 14. involved,
  11. 15. a tall plant,
  12. 16. shared beliefs or behaviours,
  13. 19. human beings,
  14. 20. alive,
Down
  1. 2. within one's financial means,
  2. 7. united or joined,
  3. 10. places where goods are sold,
  4. 12. a colour between yellow and blue,
  5. 13. festivals,
  6. 17. safe for walkers,
  7. 18. group of people with common interests,