For most people on earth, the dark
skies our ancestors had have disappeared. The problem
is urban sky glow, due mostly to too much bad lighting.
This is also described as "light
pollution".
One solution to this problem involves improving our
nighttime lighting. It would save us a great deal of
energy (and money). The reduced use of energy reduces
emissions which then helps clean our air.
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Click above to see
a full-sized (535 KB) image of NASA's
satellite view of the earth at night.
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For additional information, visit the International
Dark Sky Association web site.
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