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