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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