Across
- 3. using old things, or parts of them, again
- 5. making things dirty
- 8. waste, things people throw into the bin, litter
- 10. substances coming out of chimneys or exhaust pipes
- 11. A big problem we all face is ... change
Down
- 1. cars, busses, trams, underground trains moving through and between cities
- 2. something that can be composted
- 4. the existence of many different plants and animals
- 6. something that still works in the future, something that lasts a long time
- 7. things that cannot be used anymore, junk
- 9. American English for petrol