I trembled to think of a world without stars. No guide for...

I trembled to think of a world without stars. No guide for the sailor to trust at see, no jewels to dazzle our sense of beauty [...] But all around the globe, the air is so dirty and the lights from the cities are so bright that for some people few stars can be seen anymore. A generation of children may grow up seeing a blank sky and asking, "Did there used to be stars there?