What happens if you cut down all of a city's trees?

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Across
  1. 3. – Sacred tree associated with enlightenment.
  2. 5. – Disaster prevented by tree roots.
  3. 8. – Supertrees in Singapore collect solar power for this.
  4. 9. – Green spaces in urban areas.
  5. 12. – Problem reduced by tree cover in summer.
  6. 14. – Vertical gardens in Singapore.
  7. 16. – Variety of life supported by trees and forests.
  8. 18. – Collected and absorbed by trees.
  9. 19. – Essential part of nature that cleans air and provides shade.
Down
  1. 1. – Trees help protect this from becoming salty.
  2. 2. – Trees provide this to cool urban areas.
  3. 4. – System for watering crops, used in ancient cities.
  4. 5. – Natural areas of trees, vital for biodiversity.
  5. 6. – Ancient city affected by soil salinization.
  6. 7. – Disease spread in hot, unsanitary cities.
  7. 10. – Trees purify this by trapping pollutants.
  8. 11. – Part of trees that trap carbon and purify air.
  9. 13. – Trees are an essential part of this.
  10. 15. – Type of forest created in cities.
  11. 17. – Tree parts that prevent floods and hold soil.