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Plastic bottles are made from oil - a fossil fuel that will one day run out. It is important to make use of materials like plastics that can be recycled and re-used, rather than continually exploiting the fossil fuels used to make them in the first place.
In Britain we throw away about 455,000 tonnes of plastic bottles every year - that's around 9.1 billion bottles! Many of these end up in landfill where, because plastic bottles are very light but very bulky, they take up lots of space.
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