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.
Colorado's Great Sand Dunes National Park, which contains the highest sand dunes in North America, provides stunning views in the shadow of the majestic Sangre de Cristo Mountains.inter snow curtails trips into the high mountains, though the dunes can still be visited. How to Visit. Stop at the visitor center for a quick lesson in the Great Sand Dunes environment, and to learn the schedule of ranger-led walks and programs (summer only). From there, proceed to the dunes parking lot.