ENVIRONMENT

4. To extract and reuse (useful substances found in waste).
5. The cutting down and removal of all or most of the trees in a forested area.
6. the glow from street and domestic lighting that obscures the night sky and hinders the observation of faint stars.
7. Water that has been used, as for washing, flushing, or in a manufacturing process, and so contains waste products; sewage.

1. any substance, such as manure or a mixture of nitrates, added to soil or water to increase its productivity
2. Fog that has become mixed and polluted with smoke.
3. The phenomenon whereby the earth's atmosphere traps solar radiation, caused by the presence in the atmosphere of gases such as carbon dioxide, water vapor, and methane that allow incoming sunlight to pass through but absorb heat radiated back from the earth's surface.
6. A method of solid waste disposal in which refuse is buried between layers of dirt so as to fill in or reclaim low-lying ground.