The amount and brightness of light from towns and cities around the world at such a high level that it is the darkness of night. Once upon a time, when night-time , we were into darkness. Things are different, and brighter today. A study in the journal Science Advances reports that artificial light at night is in most countries worldwide. Scientists say it by 2.2 per cent a year between 2012 and 2016. The intrusion of artificial light into out night-time is us many problems. The International Dark-Sky Association says it, "is not only our view of the universe, it is adversely our environment, our safety, our energy consumption and our health".
Study co-author Franz Holker said artificial light a threat to our natural environment. He said: "Artificial light is an environmental pollutant that nocturnal animals and plants and microorganisms." He added: "[It] ecological and evolutionary implications for many organisms from bacteria to mammals, including us humans, and may entire social ecological systems." Many environmentalists the introduction of LED lights would the planet. However, cities are more LED lights because they are cheaper, which is to the light pollution. Night-time light in 16 countries, including war-torn nations such as Yemen and Syria.