One is to destroy the ecological environment. Most animals do not like strong light at night. Strong light can destroy the normal breeding process of insects and birds at night, and the ecological balance will be seriously damaged. Second, it harms human health. People who work and live in a light pollution environment for a long time will suffer different degrees of damage to the retina and iris, and their eyesight will suffer a sharp decline. The incidence of cataract is up to 45%, and people will become dizzy and upset, and even suffer from insomnia, loss of appetite, depression, physical weakness and other similar neurasthenic symptoms. Third, it is not conducive to the harmonious development of the city. Outdoor night lighting will disturb the light and increase the probability of traffic accidents. Reflected light aggregation is also easy to cause fire, which brings a lot of adverse effects on people's life; Fourth, it is not conducive to environmental protection. The abuse of light appliances increases the emission of carbon dioxide, affects the urban environment and climate, and intensifies the urban "heat island phenomenon

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