A symposium on sources, sinks, and concentrations of carbon monoxide and methane in the earth's environment was held at the Happy Dolphin Inn, St. Petersburg Beach, Florida, August 15–17, 1972. This was a joint meeting of the American Geophysical Union and the American Meteorological Society and was cosponsored by the Department of Transportation, the Environmental Protection Agency, the National Aeronautics and Space Administration, and the National Oceanic and Atmospheric Administration. Approximately 80 scientists attended the meeting, at which 26 papers were presented. The attendees came from Australia, Belgium, Canada, Great Britain, and West Germany as well as from the United States and included most of the world's top scientists involved in the conference topic. S. Fred Singer of the University of Virginia acted as General Chairman of the symposium.