Earth Hour Crossword

4. Collect rubbish in order to treat it and produce useful materials that can be used again
7. a useful or valuable possession or quality of a country
8. The 3rd planet from the sun
11. Renewable forms of energy can be produced as quickly as they are used
15. the general weather conditions usually found in a particular place
17. Naturally existing in a place country rather than arriving from another place
19. Able to use more than one time
20. a gradual increase in world temperatures caused by gases

1. the protection of plants and animals
2. To become or to make something become smaller in size
3. to keep something as it is
5. The number and types of plants and animals that exist in a particular area or in the world generally
6. the cutting down of trees in a large area
9. to reduce something in size or amount
10. to make an area or substance
12. Able to continue over a period of time
13. a poisonous form of oxygen
14. Fuels, such as gas, coal and oil
16. the practical, especially industrial, use of scientific discoveries
18. the natural environment in which an animal or plant usually live