Environment

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Across
  1. 3. That can be changed by the action of bacteria to a natural state that will not harm the environment.
  2. 5. The gases produced when an engine is working.
  3. 6. To make a substance or place dirty or no longer pure by adding a substance that is dangerous or carries disease.
  4. 7. Carbon.... : A measure of the amount of the earth’s resources used by a person or a population that lives in a particular way.
  5. 8. The use of natural products and energy in a way that does not harm the environment.
Down
  1. 1. (Of energy and natural resources) that is replaced naturally or controlled carefully and can therefore be used without the risk of using it all up.
  2. 2. Rain that contains harmful chemicals from factory gases.
  3. 4. Gases, etc. that are sent out into the air.