There's a Curious Effect Urban Trees Might Have on Depression, Study Finds (sciencealert)
Researchers used antidepressant prescriptions rather than self-reporting to gauge the mental health of communities, and then cross-referenced these statistics with the numbers of street trees in each area. They reported that more local foliage within 100 metres (328 feet) of the home was associated with a reduced likelihood of being prescribed antidepressants – findings that could be very useful indeed for city planners, health professionals, and governments.