Environment

4. WARMING the recent increase in the world's temperature that is believed to be caused by the increase of certain gases (such as carbon dioxide) in the atmosphere
7. FUEL a fuel (such as coal, oil, or natural gas) that is formed in the earth from dead plants or animals
8. includes living things, such as plants and animals, and things that are not living, such as rocks, soil, sunlight, and water.
9. the action or process of making land, water, air, etc., dirty and not safe or suitable to use
11. a region with particular weather patterns or condition
14. no longer existing
16. capable of being slowly destroyed and broken down into very small parts by natural processes, bacteria, etc.
17. the conditions that surround someone or something the conditions and influences that affect the growth, health, progress, etc., of someone or something

1. the act or result of cutting down or burning all the trees in an area
2. a person who works to protect the natural world from pollution and other threats
3. the gradual destruction of something by natural forces (such as water, wind, or ice) : the process by which something is eroded or worn away
5. MONOXIDE a poisonous gas that is formed when carbon is not completely burned and especially when gasoline is burned in car engines
6. made to be used once or only a few times : made to be thrown away after one use or several uses
10. used to describe a type of animal or plant that has become very rare and that could die out completely
12. the act of producing or sending out something (such as energy or gas) from a source
13. to make something new from (something that has been used before)
15. DIOXIDE a gas that is produced when people and animals breathe out or when certain fuels are burned and that is used by plants for energy