For stressed-out workers, this may someday be a doctor's prescription: Walk around in the woods.

Scientists in Japan have been learning a lot in recent years about the relaxing effects of forests and trees on mental and physical health. Based on their findings, some local governments are promoting "forest therapy."

Experience shows that the scents of trees, the sounds of brooks and the feel of sunshine through forest leaves can have a calming effect, and the conventional wisdom is right, said Yoshifumi Miyazaki, director of the Center for Environment Health and Field Sciences at Chiba University.