Perspectives of the problem
There are solutions to all these problems. The key is simply to have quality lighting. With this it is possible to preserve dark skies, improve the quality of night lighting (better visibility, security and more attractive environments) and it also implies saving money, by using light efficiently. To be successful in these purposes, you need to be aware of the problem and the solutions, which is quite rare (even among lighting professionals). Education is key to success.
In broad terms, the risk is that within a few generations only a few people will be able to have a "live" view of the Universe. Urban glare will have made the dark sky disappear, just as the light on in a living room makes it impossible to see a slide show. This is why light pollution is such an important issue, just as global warming is.
«Light up the ground, not the sky»
It is ideal to become aware of the situation. Insist on quality lighting and practicing it yourself, especially the amateur astronomer. Good lighting is directed towards where it is required, not upwards or towards where it is lost and produces glare and light invasion.
Of course, this does not mean that reducing luminosity also decreases safety, since fewer luminaires are not required, but simply that they aim well. The representative institution in this area is International Dark Sky Association, GOING (International Dark Sky Association), non-profit organization whose goal is dissemination and solutions to the problem.
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