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.
A lot of history has happened across Gobi's dunes, too. The desert is home to the first fossilized dinosaur egg ever found, as well as many other important fossil discoveries. It was part of the great Mongol Empire, the largest contiguous empire in history, during the 13th and 14th centuries.obi is a cold desert, thanks to its northern location and height (roughly 1520 meters above sea level at the area's highest points). As a result, sometimes frost and even snow can be seen capping Gobi's dunes.