Across
- 4. Energy from moving air
- 5. Zero-emission way to travel
- 7. Double-pane ones save heat
- 8. Process old materials into new ones
- 10. Natural air cleaner
- 11. Add material to keep heat in or out
- 13. Place for solar panels
- 14. Action to reduce energy use
- 15. Planet we make sustainable
- 17. Eco-friendly way of living
- 18. Flat solar collector on roofs
Down
- 1. Energy from the sun
- 2. Low-energy transport
- 3. Weatherstrip this to stop drafts
- 4. Resource to conserve in homes
- 6. Efficient ones are LEDs
- 9. Use less of something like water or power
- 10. Machine that makes wind power
- 12. Power we use for lights and heat
- 16. Type of bulb that saves energy