Nature in danger

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Across
  1. 3. to continue to live or exist
  2. 5. to make sure that somebody/something is not harmed, injured, damaged, etc.
  3. 7. a substance added to soil to make plants grow more successfully
  4. 8. (of a type of plant, animal, etc.) no longer in existence
Down
  1. 1. to completely destroy a place or an area
  2. 2. to catch a person or an animal and keep them as a prisoner or in a confined space
  3. 4. to stop something from being done or used especially by law
  4. 6. the young of an animal or plant