The rapid increase in outdoor lighting is spreading light pollution.The amount of light pollution is increasing so fast that in 20 years starswill no longer be seen in large regions.This can have biological effects on species that need dark or arethreatened by dark. This could drive some species to extinction.Around 2006, in a taxi from Lake Titicaca to La Paz, I saw amazingvistas of stars. I wonder if those still exist.