The environment

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Across
  1. 3. useless
  2. 4. crucial
  3. 6. pervasive
  4. 8. persistent
  5. 10. likely
  6. 11. impossible
Down
  1. 1. possible
  2. 2. challenging
  3. 5. beneficial
  4. 7. unlikely
  5. 9. unaffected
  6. 12. unavoidably