Deepinthewoods - you've raised one of my favourite (or is that least favourite) bugbears.
How can we possibly cut down the amount of power which has to be generated when we are so profligate with its use? We don't NEED all that light washing up into the Heavens - it's easy enough to shade it, or to turn off most of the lights left on at night.
And give a thought to all the animals and in particular birds, which are disrupted by nights being so bright.
Imagine what our world looked like before electric light