Have you ever noticed that the night sky is no longer inky black and full of stars like it used to be? Have you noticed the strange orangish glow thats replaced it? The strange orangy glow is a form of light pollution referred to as sky glow.
Sky glow is probably the most recognizable aspect of light pollution. By far the largest segment of the population equates sky glow with light pollution. This is wonderful, as it shows a growing awareness of the problem. As a quick refresher, sky glow is the glow we see above cities and towns when viewed from a distance. The intensity of the sky glow is an indication of the quantity of exterior lighting which is wastefully shining up into the night sky.
To put the problem in perspective, estimates place the cost for the US alone in the neighborhood of$5-10 billion dollars annually. This is not the sum total of all outdoor lighting, this is just that portion of outdoor lighting that is so misdirected as to light up the night sky. This is an incredible sum of money to simply waste, and yet that’s exactly what we do year after year. In fact, the problem is actually increasing in magnitude and cost.
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