Is the Earth Getting Warmer

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