Chlorofluorocarbons or CFCs are a chemical compound containing carbon, chlorine, and fluorine. Throughout the 20th century, CFCs were mass produced for their popularity in refrigeration and spray cans. In the 1970s, evidence began to show the harmful effects of CFCs on Earth.
Originally created as Great Sand Dunes National Monument on March 17, 1932, Great Sand Dunes National Park and Preserve was established by an act of the United States Congress on September 13, 2004.
Unlike most national parks in the lower 48 states, Great Sand Dunes National Park is equipped with a preserve which allows hunting; the preserve designation is absent from most of the lower 48.urther off of the great sand dunes in this high desert valley, precipitation numbers are exceedingly low. However, precipitation is still very low on the great sand dunes, averaging just above 11 inches (280 mm) of rainfall per year.