Check out Earth at night as seen from a new NASA-NOAA satellite:
The manmade light that we see means that it is wasted energy as light should illuminate the surrounding area, not be directed into the night sky.
Perhaps there will come a day (or night!!!) when we see far less light directed into the sky as a result of better illuminating technology and design.
We can ill afford wasted energy and light pollution.
Sky Guy in VA