One such plot - Mount Wachusett in western Massachusetts - caught the attention of scientists from the nearby Harvard Forest near Petersham, Mass.

The Harvard Forest itself, while logged in Colonial days, is returning to old-growth condition after centuries of care.

Harvard Forest is open to the public.

Harvard Forest is also slated to be the northeastern core site of the National Ecological Observatory Network.

A number of smaller research programs are also conducted in Harvard Forest.

Mixing ratios above Harvard Forest, MA.

In situ measurements of tracers at Harvard Forest since 1995.

The southern part of Athol, bordered by the Harvard Forest and the Quabbin Reservoir, offers some of the most beautiful hiking trails in the area.

The researchers, who reported on their work in the March 28 issue of Science, used data from the Harvard Forest, an experimental tract in central Massachusetts.

He served as director of the Harvard Forest from 1946 to 1967.