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An unread, unused copy: no writing or highlighting, and no missing or damaged pages. Every book we sell is brand new, including our lowest-priced titles.
We use different kinds of energy every day to give power for cars and lights and factories.
What else needs energy to make it work? For a long time, people have used fossil fuels found under the ground and the sea. Coal, oil, and gas were formed from animals and plants that lived millions of years ago, but fossil fuels will not last forever. New types of fuel must be found to power the world!
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