Future generations

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Across
  1. 3. domestic fowl, such as chickens, turkeys, ducks, and geese.
  2. 4. help or encourage (something) to increase or improve.
  3. 5. the flesh of fully grown sheep used as food.
  4. 6. Animal, which tends to build dams.
  5. 8. a cultivated plant that is grown on a large scale commercially
  6. 11. (of a structure) suddenly fall down or give way.
  7. 12. eat, drink, or ingest (food or drink).
  8. 15. meat from a deer.
  9. 16. move from one region or habitat to another according to the seasons.
  10. 17. an animal that feeds on other animals.
  11. 18. cut with a wide, sweeping movement, typically using a knife or sword.
  12. 19. a dangerous, difficult, or otherwise unfortunate situation.
  13. 20. make it difficult for (someone) to do something or for (something) to happen.
Down
  1. 1. absolutely necessary; essential.
  2. 2. following each other continuously.
  3. 7. in, relating to, or characteristic of the countryside rather than the town.
  4. 9. a decision on an issue of fact in a civil or criminal case or an inquest.
  5. 10. be superior to in action or performance.
  6. 11. take action to reduce or prevent (something bad or undesirable).
  7. 13. land consisting of marshes or swamps; saturated land.
  8. 14. the action of clearing a wide area of trees.