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Human Impact Partners Evidence Base

Articles in Access to parks and open space leads to positive general health and wellbeing and improves healing.

  • A classic study demonstrated that patients with views of trees vs. views of a brick wall had shorter hospitalizations, less need for painkillers, and fewer negative comments in the nurses' notes.


    Ulrich RS. 1984. View through a window may influence recovery from surgery. Science 224:421.

  • Research in the Netherlands found that in areas where 90% of the environment around the home is green, only 10.2% of the residents feel unhealthy, as compared with areas in which 10% of the environment is green, where 15.5% of the residents feel unhealthy.


    Maas J, Verheij RA, Groenewegen PP, de Vries S, Spreeuwenberg P. 2006. Green space, urbanity, and health: how strong is the relation? J Epidemiology Community Health 60(7):587-592.

  • Living in proximity to green space is associated with reduced self-reported health symptoms, better self-rated health, and higher scores on general health questionnaires.


    Vries S, de Verheij RA, Groenewegen PP, Spreeuwenberg P. Natural environments - healthy environments? An exploratory analysis of the relationship between green space and health. Environment and Planning. 2003;35(10):1717-1731.

  • All types of green space were found to be effective at improving health status in a study conducted in the Netherlands. The study found the same benefit from living near city parks, agricultural areas, and forests.


    Trust for Public Land. The Benefits of Parks: why America needs more city parks and open space. 2005.

  • Research has shown that a natural environment and green space have a positive effect on health and wellbeing by reducing stress and fatigue and improving mental health and longevity.


    Groenewegen, PP, van den Berg, AE, de Vries, S, Verheij, R. Vitamin G: effects of green space on health, well-being, and social safety. BMC Public Health 2006, 6:149.

  • A review article in the journal, Alternative Therapies in Health and Medicine, cites evidence that interaction with the natural world is a vital part of biopsychosocial-spiritual well-being. Studies reviewed showed that recovery from stressful situations occurred more quickly in individuals who viewed nature scenes than it did for those who viewed a traffic video or a video of a pedestrian mall.


    Irvine, KN, Warber, SL. Greening healthcare: Practicing as if the natural environment really mattered. Alternative Therapies in Health and Medicine. Sep/Oct 2002; 8,5; pg. 76.

  • Without outdoor places to play, children are less likely to exercise regularly and may face elevated risks for diabetes, obesity, and asthma.


    Trust for Public Land. No Place to Play: a comparative analysis of park access in seven major cities. November 2004.

  • Children performing activities in green settings have shown reduced symptoms of Attention Deficit Hyperactivity Disorder. Furthermore, the “greener” a child’s play area, the less severe his or her attention deficit symptoms.


    Faber Tyler A, Kuo FE, Sullivan WC. 2001. Coping with ADD: The surprising connection to green play settings. Environment and Behavior. 33(1): 54-77.