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.
Half of Colorado is public land, preserved in four national parks, eight national monuments, four national historic trails, two national historic sites, nine national forests, 42 state parks and one national recreation area.Start exploring now!ecently elevated to a national park, Great Sand Dunes National Park & Preserve contains some of the highest inland sand dunes in the world. Located at the eastern edge of the San Luis Valley in southern Colorado, the dunes rise to heights of 800 feet/252 meters. It is possible to walk and climb the dunes.