Across
- 4. A chemical added to the food to avoid its going off.
- 5. gases Gases which are responsible for the greenhouse effect, including carbon dioxide, methane, ozone, and the fluorocarbons.
- 7. rain Rain that contains a high concentration of pollutants.
- 8. warming An increase in the average temperature of the earth's atmosphere causing climatic change.
- 9. The act of preserving the environment.
Down
- 1. species A species at risk of extinction because of human activity, changes in climate.
- 2. The collection and often reprocessing of discarded materials for reuse.
- 3. The cutting down and removal of all or most of the trees in a forested area.
- 4. The introduction of harmful substances or products into the environment.
- 6. Food wastes, trash, rubbish.