Energiequellen

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Across
  1. 4. clean
  2. 5. less/fewer
  3. 6. low
  4. 7. to produce
  5. 9. need for space
  6. 11. sustainable
  7. 12. reliable
  8. 13. pollution ("environmental burdening")
Down
  1. 1. infinite ("without borders")
  2. 2. radioactive waste (11,7)
  3. 3. crude oil
  4. 8. building costs
  5. 10. available
  6. 14. finite