To make a waste product usable again.
Recycle.
Related to the connection between animals, plants, and humans, and their environment.
Ecological.
To make something smaller in amount, degree or price.
Reduce.
A piece of land under which waste material is buried.
Landfill.
A permanent change in global or regional climate patterns.
Climate change.
To break down or decompose naturally.
Biodegrade.
The natural world around us where people, animals and plants live.
Environment.
A substance or compound produced or used in a process involving chemistry.
Chemical.
Damage caused to water, air, etc. by harmful substances or waste.
Pollution.
The typical weather conditions of a particular region.
Climate.
To use something again, usually for a different purpose.
Reuse.
Materials that have no use and are unwanted.
Waste.