HUBERT RAGUET / EURELIOS / SCIENCE PHOTO LIBRARY HUBERT RAGUET / EURELIOS / SCIENCE PHOTO LIBRARY
Carbon cycle research. Researcher measuring the release of carbon dioxide from oak leaves. This work is being carried out as part of a study of the role of trees in the greenhouse effect, and the extent to which they affect levels of carbon dioxide (a greenhouse gas) in the atmosphere. Trees naturally take up carbon dioxide as part of the process of photosynthesis, but this can vary with the seasons and the presence of pollutant gases. This experiment involves the sessile oak (Quercus petraea) and a sealed greenhouse with an atmosphere of 500ppm (parts per million) of carbon dioxide.
Model release not available. Property release not required.