Solving the Puzzle of Global Warming

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Across
  1. 4. Word used to describe when scientists disagree (begins with d).
  2. 7. Home to the polar bears.
  3. 11. Without such gases, Earth would be a cold rock in space.
  4. 13. Most countries signed this Treaty to reduce emissions.
  5. 15. The level of carbon dioxide is doing this.
  6. 16. An alternative energy source.
  7. 17. You can be part of it.
  8. 19. Another alternative energy source.
Down
  1. 1. Buy more foods that are...(synonym for nearby)
  2. 2. It takes this to make packaging.
  3. 3. One of the three Rs.
  4. 5. Synonym for severe, as in weather.
  5. 6. Keeling measured this dioxide.
  6. 8. Very dry conditions, without rain.
  7. 9. The other pole.
  8. 10. Main cause of more greenhouse gases.
  9. 12. Last name of the biologist.
  10. 14. Favourite food for polar bears.
  11. 18. Turn these off when you leave a room.