Hugging a tree can be good for your health:
Futures Forum: Hug a tree > it's good for you
In fact, it's so good that being amongst trees is to be prescribed:
Futures Forum: The green prescription: 'forget your tablets and get moving'
There are clear clinical benefits, as explored by Roger Ulrich in the 1980s:
Futures Forum: The clinical benefits of trees
A particular practice coming out of Japan is Shinrin Yoku, or 'Forest Bathing':
Futures Forum: Take a walk in the forest
The weekly paper from Waitrose features 'the medicine of being in the forest':
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Futures Forum: Nature.Health.Design. Bringing nature nearer to the patient
Futures Forum: More green spaces at schools 'beneficial in the mental development of children'
Futures Forum: "Green spaces in town and cities create immediate and long lasting improvements in people's wellbeing."