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5. Reuse discarded objects or materials to create a product of higher quality or value than the original
8. Share a car journey so as to reduce carbon emissions
14. Capable of being decomposed by bacteria or other living organisms
15. Protection, preservation, or restoration of the natural environment
16. Avoidance of the depletion of natural resources in order to maintain ecological balance
17. The natural home or environment of an animal, plant, or other organism
18. Last name of Earth Day's founder
20. Emissions that contribute to global warming

1. The variety of life in the world or in a particular habitat
2. A biological community of interacting organisms and their physical environment
3. The action of clearing a wide area of trees
4. Type of energy that comes from sources that naturally replenish
6. Energy derived from the sun's rays
7. A global issue Earth Day aims to combat
9. Relating to farming without the use of artificial chemicals
10. The presence in or introduction into the environment of a substance harmful to living organisms
11. Turning waste into reusable materials
12. Decayed organic material used as a plant fertilizer
13. Wild animals collectively; the native fauna of a region
19. A layer in the earth's stratosphere containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun