environment

4. A gas that causes the greenhouse effect, especially carbon dioxide.
6. Pollution in the atmosphere.
9. Not now existing.
10. An unnecessary or wrong use of money, substances, time, energy, abilities...
12. To tell someone that you will do something bad to them if they do not do what you want
13. energy that is produced using the sun, wind, etc...

1. A measurement of the amount of carbon dioxide that activities produce.
2. The air, land, and water where people, animals, and plants live.
3. The level of the sea’s surface, used to measure the height of an area of land.
5. Fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago.
7. A chemical element that is a gas with no smell or colour. It forms a large part of the air on earth, and is needed by animals and plants to live.
8. A device that changes energy from the sun into electricity.
11. The measured amount of heat in a place or in the body.