fossil fuels, coal or oil that was formed over millions of years from parts of dead animals or plants, to emit, to send out something such as light, heat, sound, gas, etc., acid, a chemical, usually a liquid, extinct, no longer in existence, to consume , to use something, especially fuel, energy or time, dump, a place where waste or rubbish is taken and left, to reduce, to make something less or smaller in size, quantity, price, etc, exhausted fumes, smoke, gas, or something similar that smells strongly or is dangerous to breathe in, to decompose, to break a substance down into smaller and simpler parts, renewable, that is replaced naturally or controlled carefully and can therefore be used without the risk of using it all up.

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