1.
Cutting down large areas of trees
2.
Harmful substances entering the environment
3.
Turning used materials into something useful again
4.
A community of living things and their environment
5.
The variety of different living things in an area
6.
Protecting nature and natural resources
7.
The natural home of a plant or animal
8.
A structure that traps heat to help plants grow
9.
A resource that can be naturally replaced
10.
When a species completely dies out
11.
The usual weather conditions of a place over a long time
12.
An element found in carbon dioxide and living things
13.
A group of similar organisms that can reproduce
14.
Using resources without harming future generations
15.
Decayed food and plant waste used to improve soil
