Who is protecting our planet?

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Across
  1. 4. Changes in a plant or animal to fit a location.
  2. 5. A place with very low rainfall and extreme temperatures.
  3. 7. The variety of plants and animals.
  4. 8. The clearing of trees.
  5. 15. A measure of the amount of heat.
  6. 16. A slow moving mass of ice.
  7. 17. The area either side of the equator.
Down
  1. 1. A community of plants and animals.
  2. 2. Rainfall, snow, hail and sleet.
  3. 3. The state of the atmosphere.
  4. 6. A dense hot forest with lots of plants and animals.
  5. 9. The surroundings in which an animal or plant lives.
  6. 10. A line of latitude that runs through the centre of the earth.
  7. 11. Long term weather conditions of a place.
  8. 12. The difference between the highest and lowest.
  9. 13. A region with mild temperatures.
  10. 14. The areas at the North and South of the earth.