1				2
																			3
		4				5			6															7
8
														9
				10						11
																					12
																	13
			14
								15
	16
															17			18
19									20
																								21
22										23						24
25																		26
								27
	28														29

Across 1. Term for reduction eg in the ozone layer. 6. Using energy with little or no waste. 8. Gas formed by a natural or industrial process. 11. Rain, snow, sleet are all forms of ___________________. 13. Rise; greater quantity. 14. Agricultural contributor to CO2 production through land use. 15. A form of oxygen; greenhouse gas. 19. Tidal wave. 20. Substance causing increased temperatures. 22. Increase in average annual temperatures over land and oceans. 25. The percentage of moisture in the air. 26. A big wind in the northwest Pacific region. 27. A by-product of petroleum used widely for containers, 28. Energy from the sun. 29. Replaceable.

Down 2. Tsunami, typhoon or excessive winds. 3. An effect of global warming. 4. Where carbon is stored. 5. Burning. 7. Alternative to fossil fuels. 9. An alternative fuel. 10. Fuels made from plants. 11. Toxic substances in the air or water supply. 12. Underground storage of carbon. 16. Petrol, oil and coal are ........... ............ 17. Solid fuel formed long ago by plants. 18. How hot or cold the air is. 21. When this erupts, a great deal of heat is produced. 23. A gas produced by cattle. 24. Rotating storm system with strong winds and spiralsing thunderstorms.