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Not harmful to the environment; eco-friendly. It refers to products or practices that help conserve the environment.

The termination of a kind of organism or of a group of kinds, usually a species. It means no more individuals of that species exist.

A slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles. A key term in TOEFL topics about climate change and geology.

The amount of rain, snow, sleet, or hail that falls to the ground in a specific area during a specific period.

Materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.

The state of living or inhabiting a certain place. It is primarily used to describe animals or plants living in their natural habitat.

The way in which plants, animals, and people are related to each other and to their environment, or the state of such relationships. Essential for TOEFL environmental science.

Able to be maintained at a certain rate or level. In modern contexts, it often refers to environmental sustainability—conserving an ecological balance by avoiding depletion of natural resources.

To be completely used up or exhausted, so that nothing remains. Often used for natural resources, funds, or human energy.

Not occurring naturally; created, caused, or influenced by human activity or intervention.