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Across 4. The greenhouse gas that is produced from burning trees (2 words). 6. The process that describes how carbon enters the soil after organic matter dies and falls to the ground. 7. A greenhouse gas that increases as the ocean temperature rises; this is thought to explain the increased severity of hurricanes this decade. 9. The chemical reaction that plants and animals depend on to generate energy; it produces carbon dioxide as an end result. 13. The type of heat radiation that greenhouse gases absorb (two words). 14. The originating source of the Earth's energy input. 15. This term refers to reducing energy and resource use; it is one of the most practical ways to address the issue of global warming. 16. A reservoir of carbon formed by marine organisms. 17. The pattern of weather conditions that occurs in a region over a long period of time. 18. What the sea level has already done in some areas as a result of global warming.

Down 1. The term that follows after water and carbon, and describes a process where matter moves from place to place. 2. The chemical reaction that results in the removal of carbon from the atmosphere into the tissues of a plant. 3. The human activity that reduces an important carbon sink and destroys animal habitats. 5. Increasing average global _________ of both the air and the oceans has directly caused diminishment of land and sea ice. 8. The natural phenomena that is responsible for preventing some heat radiation from leaving our planet is called the ____ effect. 10. People who challenge the truthfulness of the statement that global warming is virtually certain. 11. The reservoir of carbon that formed millions of years ago and is buried deep underground (2 words). 12. The most abundant element in living organisms; it amounts to about 2/3 of the matter after removing water.