Plastic is made from oil, which is also used as energy to make the bottles and to transport them. Plastic does not easily degrade and ends up polluting water, land and air, whether disposed of or recycled. In addition, the water contained in the bottles in China is often of poor quality and therefore unhealthy-see the website below. 

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Further reading: 

• Dangers of China's bottled water

• Simple steps and methods to make single-use plastics unnecessary

• Wastefulness of bottled water