Environment

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Across
  1. 4. a gas, especially carbon dioxide or methane
  2. 5. a building where electricity is produced to supply a large area
  3. 7. a tropical forest with tall trees that are very close together, growing in an area where it rains a lot
  4. 8. the process of making air, water, soil etc dangerously dirty and not suitable for people to use
Down
  1. 1. n area of thick ice that permanently covers the North and South Poles
  2. 2. a general increase in world temperatures
  3. 3. the cutting or burning down of all the trees in an area
  4. 6. a long period of dry weather when there is not enough water for plants and animals to live