Environmental issues

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Across
  1. 4. the variety of kinds of life in an ecosystem
  2. 7. gases sent into the air
  3. 8. the use of machinery to make farming more productive: agricultural...
Down
  1. 1. the part of the farming industry devoted to raising animals: ... sector
  2. 2. the permanent destruction of forests
  3. 3. the industry of farming
  4. 5. being able to be maintained
  5. 6. the use of a resource