urban trees as an upstream solution to promote human health · urban trees as an upstream solution...
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Urban Trees as an Upstream Solution
to Promote Human Health
Kathleen Wolf, Sharon Lam,
Jennifer McKeen, Gregory Richardson
University of Washington (Seattle), University of
Toronto, Natural Resources Canada, Health
Canada
PS 3.4 Changing
Benefits
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World Health Organization
Definition of Health
A state of complete
physical, mental, and social well-being
and not merely the absence
of disease or infirmity (1946)
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Urban Nature for Health
This Photo by Unknown Author is licensed under CC BY-NC-ND
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City Trees and Human Health:
A Systematic Review
Purpose: carefully collect and synthesize the
peer-reviewed evidence concerning city trees and
human health
Sponsors:
USDA
Forest
Service
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Project Team
Kathleen Wolf, Ph.D., University of Washington
Sharon Lam, MSc, University of Toronto
Jennifer McKeen, MPH, Simon Fraser
University
Gregory Richardson, MUP, Health Canada
Matilda Van Den Bosch, M.D, University of
British Columbia
Adrina Bardekjian, Ph.D., Tree Canada
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Methods
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Final Article Collection
182 articles
diverse methods, populations, measures,
and study locations
conducted by multiple disciplines
study examples and synthesis . . . .
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Urban Forests and Newbornsthe natural environment and pregnancy outcomes . . .
10% increase in tree-canopy cover
within 50m of a house
= lower number of low weight births
(1.42 per 1000 births)
Donovan et al., Health & Place 2011; Hystad et al., Env Health Perspectives 2014
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Trees & Physical Activity
• school children in cities grades 6 to 8
• relationship of tree cover to outside-of-school physical
activity
• 5% increase in treed area cover =
5% increase in free-time physical activity
Janssen et al. 2015. International Journal of Behavioral Nutrition and Physical Activity
KCET Los Angeles
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Sacramento, CA Study :: LIDAR x CHIS data
7,900 adults, 250 m buffer, covariates
Ulmer et al. 2016. Health & Place. Multiple health benefits of urban tree
canopy: The mounting evidence for a green prescription.
more tree cover
= better overall
health
= better social
cohesion
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1990 to 2007, 1,296 counties in 15 states
EAB infected areas vs. no bugs
15,000 more deaths from cardiovascular disease
6,000 more deaths from lower respiratory disease
controlled for demographic, human mortality, and
forest health data at the county level
Donovan et al. 2013. Journal of Preventive Medicine
2009, EAB in neighborhood
photo credits: Dan Herms, Ohio State U
Toledo, Ohio in 2006, pre EAB
Insect Damaged Tree Loss & Public Health
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Improving Depression20 adults with major depression
walk in a park setting and a built setting
50-minute walks one week apart
before-after testing:
Mood: Positive and Negative Affect (PANAS)
Cognition: Backward Digit Span (BDS)
Berman et al. 2012. Journal of
Affective Disorders
cognitive and affective
improvements after
walking in a
nature setting
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City Trees & Human Health
newborn & infant health
increased physical activity for kids
overall adult health
social cohesion
respiratory & cardiovascular health
reduced depression
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Determinants of Health
Social Determinants of Health
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Greenspace & Health Pathways
Markevych, I., et al. 2017.
Exploring pathways linking
greenspace to health:
Theoretical and
methodological guidance.
Environmental Research
158, 301-317.
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USDA Forest Service, U of WA, Health Canada, Natural Resources Canada
Literature Review – City Trees & Human Health
182
peer-
reviewed
articles
figure credit: Sharon Lam
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Limitations of Evidence
• heterogeneity of study methods, few experiments
• heterogeneity of tree or forest interventions
• lack of replication
• did not include qualitative studies
• thus, not able to conclusively state outcomes
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Implications of the Review• city trees are essential for health-supportive environments
• effects of trees vary by receptor, not always beneficial (allergy
symptoms due to tree pollen)
• benefits mediated by many factors, including the health status of
trees and forests
• integrated and proactive design and management
• manage to maximize health benefits and minimize potential adverse
impact
• collaboration between health and environmental professionals,
planning guidelines
• health equity, tree distribution
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Sponsors: USDA Forest Service,
(U&CF Program + Pacific NW Research)
University of Washington
NGO partners
Thanks!
to U of WA students:
Katrina Flora
Mary Ann Rozance
Sarah Krueger
www.greenhealth.washington.edu
Research Reviews & Summaries
Green Cities: Good Health
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USDA
Forest
Service
2018
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design:
co-author:
co-author & printing:
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design:
author:
printing:
also in Spanish!
and Arabic!
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Closing
• trees in cities, create health protective environments
• 3 domains of benefit:
• reducing harm
• restoring capacity
• building capacity
• = more partnerships for collaborative UF
planning & management
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www.naturewithin.info