A study in Portland, Oregon has found that planting trees on streets can lead to a decrease in mortality rates and that the impact becomes stronger as the trees mature and grow. A new study conducted in Portland, Oregon has found that the non-profit organization Friends of Trees' tree planting ca
The research was conducted as part of a 30-year tree-planting campaign in Portland.
The research, conducted by the Barcelona Institute for Global Health and the USDA Forest Service and published in the journal, also estimates that the annual economic benefits of planting trees far outweigh the cost of their maintenance. The results show that in neighborhoods in which more trees had been planted, mortality rates were lower. This negative association was significant for cardiovascular and non-accidental mortality , particularly for males and people over the age of 65.
“We observed the effect both in green and less green neighborhoods, which suggests that street tree planting benefits both,” says Geoffrey H. Donovan, from the USDA Forest Service and the first author of the study. The analysis took into account other factors that may influence mortality, such as income, education, and racial composition of the neighborhoods.
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