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Relating to natural resources, such as solar energy or wind power, that are not depleted when used. It describes materials or energy sources that can be replaced naturally.

Reaching a high or the highest degree; very great. Often used to describe weather, opinions, or poverty in IELTS.

Suitable or appropriate for a particular purpose, person, or occasion.

The process of eroding or being eroded by natural agents; or the gradual destruction/diminution of something like rights or value.

To make something continue in the same way or at the same level as before. It often refers to order, living standards, or physical states.

Sources of power, such as fuel or electricity, used to provide light and heat or to work machines.

To cause physical harm to something so as to impair its value or usefulness; or to cause injury to someone's health or reputation.

The introduction of harmful materials into the environment, such as air, water, or soil. It is a high-frequency topic in academic tests.

To decrease or drop sharply and rapidly.

To use up resources, energy, or time. In academic writing, it often refers to the consumption of natural resources or the energy expenditure of a system.