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.
An archaeological dig at Shell Mound, 9 miles (14 km) north of Cedar Key, found artifacts dating back to 500 BC in the top 10 feet (3.0 m) of the 28-foot-tall (8.5 m) mound. The only ancient burial found in Cedar Key was a 2,000-year-old skeleton found in 1999.