Money may not grow from trees, but something even better does.
Several longitudinal studies have shown that exposure to more vegetation is associated with lower non-accidental mortality, the authors of the new study note, and some have also linked exposure to greenery with reduced"However, most studies use satellite imaging to estimate the vegetation index, which does not distinguish different types of vegetation and cannot be directly translated into tangible interventions,"Payam Dadvand, a researcher with the Barcelona Institute for Global...
For their study, Dadvand and his colleagues capitalized on a well-documented tree-planting campaign that unfolded in Portland, Oregon, between 1990 and 2019. During those three decades, the nonprofit group Friends of Trees planted 49,246 street trees in Portland. Crucially, they kept records of where and when each tree was planted. The researchers were thus able to look at the number of trees planted in a particular neighborhood, or US Census tract – each home to about 4,000 people – during the previous five, 10, or 15 years.hey then associated each census tract's tree data with its mortality rate, due to cardiovascular, respiratory, or non-accidental causes.
The association also grows stronger as trees grow taller, the study found. Trees planted in the prior one to five years were linked with a 15 percent drop in mortality, while trees planted in the prior 11 to 15 years were linked with a 30 percent drop. Older, larger trees were thus associated with greater reductions in mortality. So, while planting new trees is great, this finding suggests preserving large trees that already exist is even more important for public health (as it also is for the
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