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Waste treatment has been one of the most challenging problems affecting modern city development.
Protecting birds in cities is another hot topic as well. The survival of birds is threatened due to the decrease of habitats and food. Nest aims to promote the interactions between human and birds to develop empathy by empty bottle/bird food exchange based on waste classification. The interactive experience of vein extension make people feel their contribution to environmental protection, help them to develop good habits of waste classification and be aware of bird preservation.