Environmental concerns

4. Make something different; alter or modify
7. The ability to meet the needs of the present without compromising the ability of future generations to meet their own needs
9. The state or process of a species, family, or other group of organisms becoming extinct
11. Not depleted when used
12. The preservation and protection of natural resources
13. The weather conditions prevailing in an area in general or over a long period

1. The clearing of forests
2. The process of converting waste materials into new materials
3. The presence or release of harmful substances into the environment
5. Occurs in impure form in charcoal, soot, and coal
6. Power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines
8. The impression left by a foot or shoe on the ground or a surface.
10. The gradual increase in the Earth's average temperature