A plaque marks the entrance to the Charles David Keeling building at the Mauna Loa Observatory in Hawaii.

A plaque marks the entrance to the Charles David Keeling building at the Mauna Loa Observatory in Hawaii. Dr. Keeling initiated continuous CO2 measurements at this site in 1958 and the measurements related to this program are among the most highly regarded achievements in the history of MLO. Dr. Keeling was the first to report that global atmospheric concentrations of carbon dioxide are rising. The graph of this rising concentration of CO2 is known as the Keeling curve. A one hour, ten minute long exposure produces star trails, or paths of the stars around the celestial poles due to the earths rotation.(140 separate exposures of 30 seconds duration are stitched together to form the star trails)