People who spend a lifetime in cities like Hong Kong, Shanghai or Beijing might not be able to see the Milky Way with the naked eye during the course of their lives.
While scientists continue to study the impact of light pollution on the skies, we know remarkably little about how artificial lights impact marine wildlife, which is a problematic gap in our knowledge because today's cities are very likely to be built near large bodies of water. By building a model around zooplankton, which are simultaneously sensitive to light and essential to marine ecosystems, they created a map allowing them and other scientists to pinpoint hotspots where marine life might be particularly vulnerable.
As those regions continue to urbanise, one problem has emerged as a significant contributor to light pollution: LED lights. Second, evidence suggests that blue light is more harmful to animals, including humans, than other colours on the spectrum. A University of Harvard study found blue light threw off participants' circadian rhythm, raising their blood sugar levels.
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