Across
- 2. scientist who wrote a paper asking is Earth getting warmer
- 4. what rises or decreases
- 6. fuels humans burn
- 9. where ice plays a role in cooling Earth
- 10. what animal population can grow or get small
- 12. what is changing?
Down
- 1. ______ warming
- 2. wax and _____
- 3. ice does this
- 5. some of global warming _____ are hard to predict
- 6. loops: processes
- 7. what is trapped in the frozen tundra
- 8. soil whose temperature is below freezing
- 11. carbon ______ traps heat