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Biodegradable materials are any substance that can be broken down into simple molecules by natural processes in the environment, eg a piece of bread which goes mouldy is broken down by fungi into simple sugars and then into carbon dioxide and water.
Most chemicals, even plastics, are actually biodegradable. The problem is that it may take hundreds, or even thousands of years for a combination of processes to happen which will break down some man-made products, leading to pollution.
Currently, more biodegradable substitutes for packaging materials are being developed and we are being encouraged to reduce our use of bags and other plastic products.
Anne Evans
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