Sources
- http://www.prb.org/educators/teachersguides/humanpopulation/urbanization.aspx
- http://www.nwf.org/Get-Outside/Be-Out-There/Why-Be-Out-There/Benefits.aspx
- http://www.ncbi.nlm.nih.gov/pubmed/18394317
- http://www.NRPA.org
- http://www.BeOutThere.org
- http://www.nytimes.com/2010/07/06/health/06real.html?_r=1
- http://seattletimes.nwsource.com/html/outdoors/2012594800_weboutside13.html
- http://www.childrenandnature.org/downloads/C&NNHealthBenefits.pdf
- http://www.childrenandnature.org/downloads/CNNEvidenceoftheDeficit.pdf
- http://getawaytotennessee.com/html/outdoor_health.html
- http://edition.cnn.com/2011/WORLD/africa/11/28/big.cities.CO2.emissions/index.html?goback=%2Egde_3861002_member_83236406
- http://www.sciencedaily.com/releases/2010/06/100603172219.htm


