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polluted

exhausted means

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turbine

Wind power is one of the earliest ___________ sources of energy used by humankind.

Nobody can predict exactly when supplies of fossil fuels will be ___________. However, we all know they quickly reduce in quantity.

Biogas can be used to ___________ natural gas in cooking, heating, or electrical generation.

Solar energy can be used for ___________ electricity, and for hot water heating.

The non-renewable sources of energy that we are using are ___________ and are bound to expire one day.

sự thiếu hụt in English means

solar in English means

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nuclear in English means