Across
- 2. pollution that affects the air and is usually caused by smoke or other harmful gases
- 3. rain mixed with acid
- 6. destruction of forests
- 8. the total amount of greenhouse gases produced to directly and indirectly support human activities
- 10. to release pollutant substances into air
- 12. the condition of having a population so dense as to cause environmental deterioration
- 13. fuels such as oil, coal, natural gas
Down
- 1. protecting natural sources
- 4. community of animals, plants living in an area which provides what they need to survive
- 5. the process of transforming waste into new products
- 7. synonym for garbage or trash
- 9. noise with harmful impact on the activity of human or animal life.
- 11. gradual warming of the earth's surface temperature
- 14. absorbs a lot of heat from the sun's rays