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Across 3. immutable observation about something in the natural environment (usually physics) (2 Words) 5. how long it takes for a population to double over time (70/growth rate, r) (2 Words) 8. engaging in consumption that is too great relative to the needs of the individual 9. idea to be tested in an experiment (2 Words) 10. recurring observation following multiple experiments (2 Words) 11. activities that meet today's needs without compromising the ability of future generations to meet their own needs 13. int'l. treat amongst industrialized nations that limits greenhouse gas emissions, not legally binding (2 Words) 15. chemicals that affect the endocrine (hormonal) system (2 Words) 16. maintaining only the necessary number of births to replace the exisiting population amount rather than increasing it (3 Words) 17. slow increase, rapid increase, leveling off (2 Words) 18. slow increase, rapid increase (3 Words) 19. a form of recycling that includes initially consuming less (3 Words) 20. placing wasted food in a container where it may pile up, fertilize, and then be used to improve soil

Down 1. population curve exceeds straight-line food curve (2 Words) 2. using again and again, saving energy and reducing pollution (composting, source reduction) 4. the presence of too much consumption by an otherwise appropriate population that proves too much for the Earth to adequately support (2 Words) 6. the presence of too much human life for the Earth to adequately support (2 Words) 7. the maximum number of organisms that an ecosystem can sustain with enough food resources and living space (2 Words) 12. the state of being incredibly poor 14. pollutants found in refrigerants, halons, insulation, electronics cleaners