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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.

Energy from a source that is not depleted when used, such as wind or solar power.

The presence in or introduction into the air of a substance which has harmful or poisonous effects.

Able to be used again or replaced naturally so that it is never finished or used up; specifically referring to energy sources.

To emit, discharge, or release substances (like gas or waste); also used metaphorically to produce talented people.

To reduce or cut down the quantity, volume, or size of something, often used for budgets, personnel, or emissions.

The act of sending out or releasing substances such as gas, heat, or waste into the environment. It is a critical term in discussions about climate change and pollution.

The envelope of gases surrounding the earth or another planet. It is essential for describing air pollution and environmental issues in IELTS.