Now newer research as reported by the U.S. Forest Service's Pacific Northwest Research Station suggests that Trees and Human health go hand in hand. Funny, this is something gardeners and landscapers have known all along. There is no doubt that more study is needed as to some of the mechanical components of just how all of this works, but clearly people in such a healthy forested or at least vegetative environment health-wise fair much better. When I look at some cities around the globe that are jam packed with human beings and the total lack of any type of vegetation and the misery suffered in those areas for various reasons, it makes you wonder the "What If ?" or "Who Knew ?" questions!
|Credit: Dan Herms Ohio State University|
A tree lined street in Toledo, Ohio in 2006,
before emerald ash borer infestation
|Credit Dan Herms Ohio State University|
Three years later in 2009, after the invasive
spread to the neighborhood.
Portland, Oregon January 16, 2013.
Evidence is increasing from multiple scientific fields that exposure to the natural environment can improve human health. In a new study by the U.S. Forest Service, the presence of trees was associated with human health.
For Geoffrey Donovan, a research forester at the Forest Service's Pacific Northwest Research Station, and his colleagues, the loss of 100 million trees in the eastern and midwestern United States was an unprecedented opportunity to study the impact of a major change in natural environment on human health.
In an analysis of 18 years of data from 1,296 counties in 15 states, researchers found that Americans living in areas infested by the emerald ash borer, a beetle that kills ash trees, suffered from an additional 15,000 deaths from Cardiovascular disease and 6,000 more deaths from lower respiratory disease when compared to uninfected areas. When emerald ash borer comes into a community, city streets lined with ash trees become treeless.
The researchers analyzed demographic, human mortality, and forest health data at the county level between 1990 and 2007. The data came from counties in states with at least one confirmed case of emerald ash borer in 2010. The findings -- which hold true after accounting for the influence of demographic differences, like income, race, and education -- are published in the current issue of American Journal of Preventative Medicine.
"There's a natural tendency to see our findings and conclude that, surely, the higher mortality rates are because of some confounding variable, like income or education, and not the loss of trees," said Donovan, "But we saw the same pattern repeated over and over in counties with very different demographic makeups."
Although the study shows association between loss of trees and human mortality from cardiovascular and lower respiratory disease, it did not prove a causal link. The reason for the association is yet to be determined.
The emerald ash borer was first discovered near Detroit, Michigan, in 2002. The borer attacks all 22 species of North american ash and kills virtually all of the trees it infests. - The study was conducted in collaboration with David Butry, with National Institute of Standards and Technology; Yvonne Michael, with Drexel University; and Jeffrey Prestemon, Andrew Liebold, Demetrios Gatziolis, and Megam Mao, with the Forest Service's Southern, Northern, and Pacific Northwest Research Stations."
(SOURCE): Tree and human health may be linked Contact: Jeffrey Donovan, (503) 808-2043, email@example.com
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