Like climate change, light pollution is an eco-problem that's tough to pinpoint and even tougher to control. It happens when we fail to properly shield or direct streetlights, resulting in uncomfortable glare; or when our neighbor's probing porch light forces us to lower our blinds. Controlling our artificially induced night glow does more than offer better sky-gazing opportunities. Researchers have found strong correlations between light pollution and certain types of cancers, as well as disruptions in wildlife health and movement.
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