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Across 5. A pollutant found in refrigerators and aerosol cans 6. 9900 joules per day, the minimum energy intake per person 9. Water-saturated sand 10. Town in Ontario where 2300 people got sick from drinking infected water 13. The type of salination that is often the combination of over-irrigation and drylands. Cities are often located on drylands, leaving the rich soils for agriculture. Irrigation is also now common in cities (gardens and recreation areas). 17. A mixture of sulfur dioxide and nitrogen oxide pollutants reach the Earth in the form of rain or solid particles 18. A type of irrigation system, 95% 21. An irritating gas that forms just above the Earth's surface 24. Removal of salt from seawater 25. The cause of increased amount of UV radiation reaching the Earth's surface 28. The buildup of excess salts in soil, restricting amount of water and essential nutrient uptake by plants. 30. The different sections of the energy pyramid

Down 1. To "feed" with water 2. Type of air pollution resulting from the burning of fossil fuels 3. The removal of soil nutrients and the loss of topsoil rich in organic matter, caused by erosion 4. Occurs when cold air is below and warm air is above, trapping pollution around a city 7. Model that illustrates the flow of energy 8. The maximum production of fish, grain and livestock. 11. Countries that suffer the most from lack of water 12. Also called manioc, a staple in much of Africa. Tapioca starch is made from this. 14. The predicted rise in average temperature in the 21st century 15. Gases that include carbon oxide and carbon dioxide 16. Land that can be used for growing crops 19. A major regional group of plant/animal communities best adapted to the region's environment. 20. The effect of mostly water vapour and carbon dioxide in the atmosphere 22. The movement of pollutants from the U.S. to Canada 23. Largest river in China 26. More than enough water 27. Where the Oak Ridges Moraine is located (name the country) 28. Pollution caused by reactions between automobile exhaust and industrial emissions 29. Sea in Asia, where the worst water-related ecological disaster ever happened