The environment

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Across
  1. 2. a renewable energy source that uses the sun’s ray
  2. 4. gas essential for human breathing
  3. 8. invasive plnats or animals in a new environmemt
  4. 9. when trees are cut down in large numbers
  5. 10. a gas that contributes to the greenhouse effect
Down
  1. 1. the gradual increase of earth’s temperature
  2. 3. the layer that protects us from UV rays
  3. 5. a practice of separating paper, plastic and glass
  4. 6. a large area covered with trees
  5. 7. type of bag banned in many countries