Bio-architecture

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Across
  1. 5. It transformed production in late 1700
  2. 8. An adjective for recycled materials
  3. 9. A material that should be avoided in bio-architecture
  4. 10. They are used for collecting the sunlight
  5. 13. It prevents overheating in a building
  6. 15. It's a highly polluting material and it's not biodegradable
  7. 16. It should be the lowest possible, on building
  8. 18. The action of taking care of a building
  9. 20. The relation between people and nature
  10. 21. Planting them near buildings is healthy
Down
  1. 1. An adjective for eco-materials
  2. 2. How the buildings should be
  3. 3. A material used for completing a building
  4. 4. The basis of the structure of a building
  5. 6. It reduces the energy consumption in a building
  6. 7. A colour which stands for 'ecological'
  7. 11. It's a natural source of energy
  8. 12. The top of a building
  9. 14. Nature is full of them
  10. 17. Liquid substance from the sky
  11. 19. An eco-material