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Across 4. These are integral to our life-support system and co-evolve with us. 7. All of us pay this for the alteration of natural resources. (2 words) 10. Problems connected to the scale of human population may include these factors. 13. In high doses PCBs are toxic and _____. 16. Continued huge amounts of carbon into the atmosphere is using the atmosphere as this. (2 words) 17. This has a correlation to human health. (2 words) 18. We can not escape responsibility for this. (3 words) 19. Food production and human health my be adversely affected if this is in the air or water. 21. Plants, animals, and microorganisms are the most irreplaceable form of this. (2 words) 22. Ecosystems play a role which is essential for this. 23. These extreme events are popping up all over. 28. Myers suggested species in such areas could be preserved by protection. (2 words) 29. Man who dominates the natural world has customarily overused this. (5 words) 33. In the U.S. DDT affected wildlife and _____. 35. This focused on slowing species extinciton when process was known to be global. 38. This adversely affects the world's environment. 42. This has affected animals that adapt to changing climates. (2 words) 44. Things change with this. 45. Of greatest concern is the accelerating loss of this. 47. These are incurred by society as a result of an activity or manufacturing. (2 words) 48. This damages sensitve aquatic and forest ecosystems. (2 words) 49. Human mobility is speedy therefore the spread of these is swift. 50. Younger Dryas is the name for this. (3 words) 51. These are necessary for fruits and vegetables. (2 words) 52. Author responsible for public taking notice of environmental problems. (2 words) 53. This is the reflection of solar radiation.

Down 1. Climate is _________. 2. Many problems develop with a very long lag time before consequences _______. 3. Global warming has this. (4 words) 5. The Ehrlichs see hunger and population as interconnected. 6. Consumption of this may result in madness, loss of bodily functions and horrific deaths. 8. One can lead to another. 9. Transplants into new ecosystems become a pest or this. (2 words) 11. With the loss of biodiversity, this is at risk. (2 words) 12. Reduce the number eating and hunger is reduced is considred playing this. (3 words) 14. This of Earth's are taken for granted. (2 words) 15. Global warming can elevate the threat of this. (2 words) 20. More and more these are traceable to human action. (2 words) 24. These need replenishment of soils and nutrients. 25. As society increases mobility, so do these. (2 words) 26. The primary cause of increasing gas emission is the burning of this. (2 words) 27. This by man can be learned from ecological footprint analysis. 30. This is the dominant ecological force and the foremost evolutionary force. 31. Climate is __________. 32. No place is untouched by this. (2 words) 34. This from the United states is important. 36. The problem of scale is ever-present in these matters. 37. Depletion of this permits more ultra-violet radiation to reach us. (2 words) 39. This human activity has the greatest environmental impact. 40. For every action this occurs. 41. Protection of species and need for this arose. 43. Not always can one emulation be applied to this extent. 46. The more inense the agriculture, the least area is available for this.