Light pollution definitely hinders the recruitment and training of amateur astronomers - at least those who have an interest in studying or measuring the night sky, or showing it to others. Nevertheless, amateur astronomers in large cities are now often content to read about astronomy. During a visit to China in 1995. I was struck by 3 the differences between amateur astronomy there, and in North America. Urban arnateur astronomers in China are much less able to escape from city lights than their counterparts in North America.
Amateur astronomers can be our strong allies in our battle against light pollution.
The risk is obvious, and is a concern to everyone involved in the space program. Until now, the prevailing attitude has been based on the fact that the risk of an impact is small - probably much smaller than the risk that the spacecraft would malfunction. But the risk is present, and increasing - like many other risks caused by modern technology. Pollution of the electromagnetic spectrum is a more complex and difficult problem, because it is largely, invisible. Radio astronomy could certainly move into space, or to the moon.