Across
- 2. Increasing population to unsustainable levels
- 3. plants or animals known to an area before European settlement
- 6. Melting of the ice in the North and South
- 8. A change in global climate patterns
- 9. Temperatures have been rising since which revolution?
Down
- 1. one that can be used again and again
- 4. A water form due to certain pollutants in the atmosphere
- 5. introduced plants or animals
- 7. smoke and other pollutants combined with fog