Squeaky says

“Clean”, “renewable”, “sustainable” - what do they all mean?

Good question. There is no universally agreed definition of “clean” energy but a lot of people would say solar, wind and tidal power - i.e. energy that comes from the Earth’s natural resources, such as sunlight, waves, wind and geothermal heat. These sources of power have two great advantages: they will never run out and, unlike oil, coal and gas, do not pollute the planet or cause dangerous climate change.

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