Our environment (U5)

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Across
  1. 4. harmful chemicals in the air and water
  2. 6. when there is no rain for a long time
  3. 8. cutting down the trees
  4. 9. ice ... (the ice in the Artcic and Antarctic)
  5. 11. fossil ... (coal, oil and gas)
Down
  1. 1. ...gases (gases that trap the sun's heat)
  2. 2. tropical forests
  3. 3. ...change (the Earth is getting hotter due to this)
  4. 5. ...dioxide (CO2)
  5. 7. tropical storms
  6. 10. ...stations (these produce electricity)