|Matter that breaks down easily in the environment.
|Decayed material from once-living things that is used to enrich soil.
|An organism that breaks down the remains of dead organisms or materials that are made from once-living things.
|Travel to natural habitats that avoids harming them and helps preserve these areas and the living things there.
|Waste that can pollute the enviornment even when it occurs in very small amounts.
|Trash that is not disposed of in a way that prevents harm to ecosystems.
|A material that causes pollution
|The addition of harmful materials to the environment.
|To collect old materials, process them, and make new items.