|  |  | Cool Map-Simulation: Growth Of Light Pollution In N. America www.yosemite.org — Picture of the growth of "light pollution" (i.e., artificial light) from 1950 to projection for 2025. Measured by Defense Meteorological Satellite Program. Map completed few years ago. Shows graphic differences among moments in time--1950, mid-1970s, 1997, and projected 2025. More... (General Sciences) Comments Email Added 2008-04-22 02:22:32 openthink