Climate Change: How Do We Know?

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Across
  1. 2. Type of electromagnetic radiation
  2. 3. Long-term atmospheric conditions
  3. 9. Gases trapping heat in the atmosphere
  4. 10. Return to a normal state
  5. 13. Large Arctic island
  6. 14. A group of experts
  7. 20. Between governments
  8. 23. Matter that settles at the bottom of a liquid
  9. 24. Marine invertebrates forming reefs
  10. 25. Pertaining to the Sun
  11. 27. Precipitation in the form of flakes
  12. 30. A set of connected things forming a complex whole
Down
  1. 1. Objects in space orbiting planets
  2. 4. Earth's southernmost continent
  3. 5. Withdrawal of glaciers
  4. 6. Temperature scale
  5. 7. Height or degree
  6. 8. Increase in acidity
  7. 11. Central parts of glaciers used for climate study
  8. 12. Element forming dioxide in the atmosphere
  9. 15. Large expanses of ice covering land
  10. 16. Outermost layer
  11. 17. Related to large ice masses
  12. 18. Large body of saltwater smaller than an ocean
  13. 19. Power derived from physical or chemical resources
  14. 21. General direction of change
  15. 22. Increase in temperature
  16. 26. Large bodies of saltwater
  17. 28. Path of Earth around the Sun
  18. 29. Frozen water