The Environment

6. releasing no greenhouse gases like carbon-dioxide or methane
7. carrying harmful bacteria or toxins that can cause disease or death
8. the order in which organisms in an ecosystem eat one another
9. a thick dirty cloud at ground level caused by pollutants reacting to sunlight
11. the complex system of relationships between living things and their environment
12. to add chemicals or organic material to soil so that plants grow better
13. the place in which a species normally lives

1. to put organic waste like vegetable peels, uneaten food, grass clippings and leaves into a large container that breaks it down into healthy soil
2. a poisonous substance that damages health or the environment
3. can be used without running out, esp. of energy sources like solar and wind
4. a careful preservation and protection of something especially : planned management of a natural resource to prevent exploitation, destruction, or neglect
5. to make something new from materials that have been used before
10. a chemical that's sprayed on crops to stop insects from destroying them