Pacala Carbon Flux Video (VIDEO) Princeton University This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption This video shows the extent to which the land acted as a source of carbon in the atmosphere (brown areas), or a carbon "sink" (green areas) that absorbed carbon from the atmosphere from 1868 to 2000. The darker the color means the greater amount of carbon an area generated or absorbed. During the 1950s and 1960s, the land switched from being largely a carbon source to primarily acting as a carbon sink. The researchers found that had terrestrial ecosystems remained a carbon source then 251 billion to 274 billion additional tons of carbon would currently be in the atmosphere. Credit Video by Sergey Malyshev, Department of Ecology and Evolutionary Biology Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.