environmental issues

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Across
  1. 5. Harmful substances in the environment.
  2. 8. Radioactive material left after using nuclear fuel.
  3. 9. A group of similar living organisms.
  4. 10. At risk of extinction.
  5. 11. The natural world around us.
  6. 12. Protection of the natural environment.
Down
  1. 1. … issues are some problems people are thinking about
  2. 2. the degree of variation of animal and plant species on Earth is called…
  3. 3. The cutting down of trees in a large area or the destruction of forests by people is …
  4. 4. Long-term shift in Earth's temperatures and weather patterns.
  5. 6. Using more resources than necessary.
  6. 7. Of great worth or importance.