The of light from our has reached such high levels that it is reducing the darkness of . A century ago, when night-time fell, the of night arrived. Things are different . A new study reports that artificial light at night is increasing around the . Scientists say it grew by 2.2 per cent a year between 2012 and 2016. This of artificial light is causing us many . The International Dark-Sky Association says it, "is not only impairing our of the universe, it is adversely affecting our environment, our safety, our energy and our health".
Dr Franz Holker said light is a to our natural environment. He called it a " that threatens nocturnal animals and affects and microorganisms". He added that it is affecting from bacteria to , including humans. He said it is reshaping " social ecological systems". Environmentalists thought LED lights would help. However, are using more LED lights because they are cheaper. This is adding to the light pollution. Night-time light decreased in 16 , including at war, like Yemen and Syria.