Climate Change.

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Across
  1. 1. a covering of ice over a large area.
  2. 4. the action of clearing a wide area of trees.
  3. 5. An increase in the overall temperature of the Earth's surface/atmosphere.
  4. 7. a fire in scrub or a forest, especially one that spreads rapidly.
  5. 9. the state of the atmosphere at a particular place and time as regards heat, cloudiness, dryness, sunshine, wind, rain, etc.
  6. 10. the weather conditions prevailing in an area in general or over a long period.
  7. 11. the envelope of gases surrounding the earth or another planet.
Down
  1. 2. a colourless,odourless gas produced by burning carbon and organic compounds
  2. 3. a violent disturbance of the atmosphere with strong winds and usually rain, thunder, lightning, or snow.
  3. 6. a glass building in which plants that need protection from cold weather are grown.
  4. 8. a prolonged period of abnormally hot weather.