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amount and brightness of light from towns and cities around the world is at such high level that it is reducing darkness of night. Once upon time, when night-time fell, we were plunged into darkness. Things are different, and brighter today. study published in journal Science Advances reports that artificial light at night is increasing in most countries worldwide. Scientists say it grew by 2.2 per cent year between 2012 and 2016. intrusion of artificial light into out night-time is causing us many problems. International Dark-Sky Association says it, "is not only impairing our view of universe, it is adversely affecting our environment, our safety, our energy consumption and our health".

Study co-author Franz Holker said artificial light is threat to our natural environment. He said: "Artificial light is environmental pollutant that threatens nocturnal animals and affects plants and microorganisms." He added: "[It] has ecological and evolutionary implications for many organisms from bacteria to mammals, including us humans, and may reshape entire social ecological systems." Many environmentalists thought introduction of LED lights would help planet. However, cities are using more LED lights because they are cheaper, which is adding to light pollution. Night-time light decreased in 16 countries, including war-torn nations such as Yemen and Syria.

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