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

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

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