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 Tottori Sand Dunes (æ» u, Tottori Sakyu) are the largest sand dunes in Japan and Tottori 's most famous tourist attraction.Located just outside the city center, they span roughly 16 kilometers of coast along of the Sea of Japan and are up to two kilometers wide and 50 meters high. short walk away from the dunes stands The Sand Museum, a unique museum that displays large sand sculptures by artists from around the world. Previously the sand exhibitions were held outdoors and in temporary structures, but in 2012 the sand museum moved into its own permanent building.