This is what the night sky should look like, with thousands of stars in view. Some unnatural light-dark cycles may even make us sick. Research is revealing that light pollution can alter the behavior of plants, animals and people. And this problem goes beyond our ability to enjoy the night sky. Sometimes lights that are meant to be helpful pose unintended harms. In many ways, lighting up the night has been a good thing.īut there can be drawbacks. Lights along roadways can make driving safer. They have allowed people to work and play beyond sundown for roughly a century. That doesn’t mean electric lights are bad. And light pollution increases every year, as cities continue to grow. residents and half of those in Europe from viewing the Milky Way. Indeed, it is considered one of the biggest forms of pollution. When artificial (human-made) light spills into areas where it’s not wanted, it’s called light pollution.
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