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Across 1. produced in breeder reactors 3. when the LD50 is 50-500 ppm 5. leading country in renewable energy production 6. Bush's future home for oil wells 11. Alcohol is a common example of this type of toxic chemical 12. when 50% of a population dies from a toxin 13. worlds leading source of biomass in developing countries 14. main ingredient in natural gas 16. number of nuclear plants built in the U.S. since 1978 20. problem exemplified by DDT 21. what most energy is wasted as 22. three mile island state 24. blood disease spread by mosquitoes 27. world's worst nuclear accident 30. leading cause of death in the U.S 31. slows down neutrons 32. separates oil 35. combined heat and power for example 38. hazard from a flood or hurricane 39. direction windows should face for passive heating 40. lowest grade distillation product 42. fuel source for a fuel cell car 46. current destination of nuclear waste 48. cheapest total costing electrical energy source 49. the nuclear dream 50. source of almost all the earth's energy 51. causes the greatest reduction in life span world wide 52. pumping heat generated by the sun 53. useful operating life of a nuclear power plant

Down 1. liquid hydrocarbons 2. nuclear fuel 4. largest producer of tar sand 5. chemicals like those found in tobacco 7. biofuel additive for gas 8. bacteria and virus hazard 9. resistance to break down 10. converts sunlight to electricity 15. least efficient device we use (waste 95%) 17. the best answer to short term energy problems 18. problem with most heavy metals 19. deadliest disease 23. Provides the highest net energy for high temperature industrial 25. don't stop viruses 26. toxicity factor you can do nothing about 28. best form of coal 29. the total amount of energy from a resource, minus the energy 33. world leader in coal consumption 34. largest consumer of fossil fuels 36. word leader in use of hydropower 37. radiation for example 41. just let the sun do its thing 43. what will happen to the availabilty of all fossil fuel reserves in the future 44. often killed by wind turbines 45. worst industrial accident 47. our favorite nuclear employee 48. most common moderator