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Across 2. chemicals that affect the endocrine (hormonal) system (2 Words) 4. population curve exceeds straight-line food curve (2 Words) 7. immutable observation about something in the natural environment (usually physics) (2 Words) 13. a form of recycling that includes initially consuming less (2 Words) 15. pollutants found in refrigerants, halons, insulation, electronics cleaners 17. activities that meet today's needs without compromising the ability of future generations to meet their own needs 18. the state of being incredibly poor 19. recurring observation following multiple experiments (2 Words) 20. using again and again, saving energy and reducing pollution (composting, source reduction)

Down 1. the presence of too much human life for the Earth to adequately support (2 Words) 3. the presence of too much consumption by an otherwise appropriate population that proves too much for the Earth to adequately support (2 Words) 5. slow increase, rapid increase (3 Words) 6. maintaining only the necessary number of births to replace the exisiting population amount rather than increasing it (3 Words) 8. the maximum number of organisms that an ecosystem can sustain with enough food resources and living space (2 Words) 9. engaging in consumption that is too great relative to the needs of the individual 10. slow increase, rapid increase, leveling off (2 Words) 11. placing wasted food in a container where it may pile up, fertilize, and then be used to improve soil 12. idea to be tested in an experiment (2 Words) 14. int'l. treat amongst industrialized nations that limits greenhouse gas emissions, not legally binding (2 Words) 16. how long it takes for a population to double over time (70/growth rate, r) (2 Words)