Across
- 1. Something plastic bags release when burned
- 5. We are all responsible as _____
- 8. Air system where condensate is collected
- 10. By 2030, the Earth will be _____
- 11. Recovered from steam and reused
- 13. Covers 70% of the Earth's surface
- 15. Over 8 billion of these live on Earth
- 16. Describes energy that is non-polluting
Down
- 2. Water from purification process
- 3. We must protect our natural _____
- 4. System that produces steam
- 6. Planet is in this kind of trouble
- 7. Energy captured from sunlight
- 9. Excess of this causes global warming
- 10. Vital to life and must be conserved
- 12. Study of how living things interact
- 14. Third planet from the sun