Across
- 5. The mixture of gases around the Earth
- 6. Increasing business, cultural and other contacts between countries
- 8. Rise in the world’s temperature
Down
- 1. Damage caused to the air by harmful substances or waste
- 2. Rain which contains harmful chemicals as a result of burning substances such as oil and coal
- 3. Environmentally friendly
- 4. Not existing any longer
- 7. Around the world