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Biodegradable wastes Non-biodegradable wastes
Waste materials which can be broken down into harmless substance in nature in due course of time by the action of microorganisms such as certain bacteria are called biodegradable wastes 
Example: cattle dung, wool, paper, compost
Waste material which cannot be broken down into harmless substances by the action of microorganisms in nature are called non-biodegradable wastes. 
Example: Plastics, polythene bags, metal articles, glass objects.

People should adopt following changes in habit: 
(a) Dispose household waste, chemical waste and hospital waste in a landfill. 
(b) Broken plastic articles such as buckets, bowls, cups, plates, etc., should be sent to plastic processing factories.

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