# Environment & Ecology

**Type:** Topic
**Words:** 13

## About

Conservation, pollution, resources, habitats, and ecological systems.

## Words by Level

### A2
- environment — The natural world of land, air, water, plants, and animals.; frequency rank 3240
- pollution — The harmful contamination of the air, water, or land with dirty or dangerous substances.; frequency rank 11480
- recycle — To process used materials so they can be made into something new.; frequency rank 18872
- die off — to gradually die until few or no members of a group remain

### B1
- waste — To use time, money, or resources badly so that they are lost or have no useful result.; frequency rank 1234
- resource — A supply of money, materials, people, or other things that can be used when needed.; frequency rank 13094
- conservation — The protection of the environment and natural resources.; frequency rank 17003
- ecosystem — All the living things in an area and the way they affect each other and their environment.; frequency rank 19138
- ecology — The study of the relationships between living things and their environment.; frequency rank 28349

### B2
- emission — A gas or substance released into the air, especially a polluting one.; frequency rank 30602

### C1
- sustainable — Able to continue for a long time without harming the environment or using up resources.; frequency rank 19738
- dispose of — to get rid of something or arrange for it to leave your possession

### C2+
- environmentalism — concern for and advocacy of the protection of the natural environment