Down
1. Materials that break down into natural substances over time are____________
3. Approximately 18 million acres of_____________
are lost each year.
4. An alternative fuel made from corn and other plants
8. Contamination of our air or water
10. Burning___________
fuels pollute the air.
11. Arctic melting endangers______________
bears.
12.___________warming threatens our environment.
14. "Reduce,________
recycle"​