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.
People and the Dunes. The major sand dunes on the north coast of Cornwall are thought to have originated more than 5000 years ago and have been used by people ever since. The sands of time hide evidence of lost settlements, places of religious worship and industrial activity, deep within the buried landscape.