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.
The Oregon Dunes are a unique area of windswept sand that is the result of millions of years of wind and rain erosion on the Oregon Coast. These are the largest expanse of coastal sand dunes in North America. Some dunes tower up to 500 feet (150 m) above sea level, providing numerous recreational opportunities including off-road vehicle use, hiking, photography, fishing, canoeing, horseback riding, and camping.